Nevermind, it’s been abandoned by the company that contributed the most to it.
https://lwn.net/Articles/882460/

I haven’t tried it myself but there is libreoffice online
https://www.libreoffice.org/download/libreoffice-online/
https://hub.docker.com/r/libreoffice/online/

Their site works fine without allowing javascript, that way it turns into quite a simple thing too!

EU is forcing some consumer friendly requirements from 20 June 2025 onwards which I imagine will give you a wider availability of models with five years of updates. Should give some incitement for the companies to join in.
https://energy-efficient-products.ec.europa.eu/product-list/smartphones-and-tablets_en

Ecodesign requirements will apply to mobile phones and tablets put on the EU market from 20 June 2025 onwards, including:

1. resistance to accidental drops or scratches and protection from dust and water
2. sufficiently durable batteries which can withstand at least 800 charge and discharge cycles while retaining at least 80% of their initial capacity
3. rules on disassembly and repair, including obligations for producers to make critical spare parts available within 5-10 working days, and for 7 years after the end of sales of the product model on the EU market
4. availability of operating system upgrades for longer periods (at least 5 years from the date of the end of placement on the market of the last unit of a product model)
5. non-discriminatory access for professional repairers to any software or firmware needed for the replacement

1. Does the distro I pick matter?
   Packages
   When you install a distro it will have repositories of apps that you can easily install and easily keep updated using either the GUI (GNOME Software for GNOME, Discover for KDE) or the package manager in terminal (dnf in Fedora, apt in kubuntu and mint). It’s similar to how you install apps on a smartphone.
   The good thing about the apps from the default repository is that they’re (in theory) tested to work well with the distro.
   You can also install applications from other sources when necessary.
   Update Frequency and new tech
   Another difference is how new kernel and software you get from the repos.
   The latest Debian Stable runs kernel 6.1 while Fedora just updated to 6.12 and arch has been running 6.12 since december.
   If you’re running the newest hardware then the chance of having drivers available automatically increases with a newer kernel.

2. Company-run distros and alternatives:
   In my opinion Ubuntu is the ones doing the most forcing as of now, and even they are angels compared to Microsoft.
   Fedora had discussions about including opt-out Telemetry to aid them getting data to improve the distro. They listened to community feedback and backpedaled that into opt-in metrics:
   https://fedoraproject.org/wiki/Changes/Telemetry
   https://fedoraproject.org/wiki/Changes/Metrics
   Debian and Arch are both examples of distros without enterprise involvement and that have no upstream distro that can affect their releases.
   Map of distros here: https://upload.wikimedia.org/wikipedia/commons/1/1b/Linux_Distribution_Timeline.svg

3. Stability of the distro:
   Of your frontrunners I’ve only run Fedora but that has been stable and been working well for me for my primary PC. So has Debian which I run on my servers (I have a Debian VM running Portainer for dockers, one for running Jellyfin and a third for Forgejo).

4. Monitor support
   Multi monitor support
   I don’t have the desktop space for double monitors personally, but I’ve heard that KDE 6 (Plasma) handles multi monitor support well.
   HDR
   Should be working since November

• https://9to5linux.com/kde-plasma-6-2-4-re-enables-hdr-mode-for-users-on-nvidia-565-and-linux-6-11

5. Both KDE and GNOME are customizable. KDE is more similar to Windows and I realized that most of my GNOME customizations was to make it more similar to Windows and KDE. I’ve since switched to KDE and must say I really enjoy having a proper file browser as default. Nautilus (default GNOME file browser) has been simplified to death and caused me to create a script to replace it with nemo.

Nvidia is a whole lot simpler to use than people make it sound like, though I’ll stay team red:
https://rpmfusion.org/Howto/NVIDIA#Current_GeForce.2FQuadro.2FTesla
Fedora guide for Nvidia drivers unless you’re running a really old card:

sudo dnf update -y # Update your machine and reboot
sudo dnf install akmod-nvidia # Installs the driver
sudo dnf install xorg-x11-drv-nvidia-cuda #optional for cuda/nvdec/nvenc support (required for Davinci Resolve)  

• Gaming including emulation
  First person shooters with kernel intrusive Anticheat won’t work in Linux as they expect to spy on a Windows OS.
  Other than that gaming on Linux is really getting there as I’m sure you’ve realized when using a Steamdeck.
  Outside of Steam you have Heroic Games Launcher, Lutris and Bottles for running windows games on Linux.
  I’m mostly using Lutris but I think Heroic Games launcher is the more popular one.
• Firefox
  Default browser in most distros
• VLC
  Available in most default distro repositories.
• Spotify
  Available as a Flatpak on Flathub, haven’t used it myself.
• Discord
  I know people has had some trouble with screen sharing but that the DiscordCanary (think Beta version) solves it.
  https://github.com/flathub/com.discordapp.Discord/issues/380
• Godot
  Can be downloaded as a simple bin file from their own site: https://godotengine.org/download/linux/
  Also available as a Flatpak on Flathub
• Visual Studio
  The closest you get is VSCode.
• Git
  Not a problem.
• Photoshop cs6, audacity, davinci resolve
  Photoshop might be trouble, Audacity and Davinci Resolve should work.
• Misc “Tinkering” (Handbrake, dvd burners/rippers, Really any weird thing I come across that I want to tinker with)
  Handbrake is available as a Flatpak on Flathub, there’s dvd burner applications available too.

Regarding HoudiniFX it seems they have Linux installs, and a free (with watermark) version for hobbyists - https://www.sidefx.com/products/houdini-apprentice/
Other than that I’d say Blender is the goto app, showing up as one of the most popular apps in the Discover app.

My recommendation would be to use clonezilla or a similar tool to make an image of your windows install and save that on the external ssd.
Then I would install Fedora KDE or whatever’s your poison on the internal drive.
If you wanna switch back to windows then you can always use clonezilla, or your tool of choice, to restore the image.
You could also use KVM/Qemu in your linux distro to restore the image into a windows vm.
virt-manager gives you a desktop gui while cockpit + cockpit-machines gives you a nice webui for handling virtual machines in linux.

Clonezilla guide, for both linux and windows
https://www.linuxbabe.com/backup/how-to-use-clonezilla-live

Both Cockpit and Virt-Manager are available in Fedora KDE’s Discover app if you prefer GUI installs:
Cockpit

Virt-Manager

Linux Routing Fundamentals

Linux has been a first class networking citizen for quite a long time now. Every system running a Linux kernel out of the box has at least three routing tables and is supporting multiple mechanisms for advanced routing features from policy based routing (PBR), to VRFs(-lite), and network namespaces (NetNS). Each of these provide different levels or separation and features, with PBR being the oldest one and VRFs the most recent addition (starting with kernel 4.3).

This article is the first part of the Linux Routing series and will provide an overview of the basics and plumbings of Linux routing tables, what happens when an IP packet is sent from or through a Linux box, and how to figure out why. It’s the baseline for future articles on PBR, VRFs, and NetNSes, their differences as well and applications.

SnappyMail seem to be a fork of Rainloop and both Rainloop and Snappymail appear to allow multiple providers - https://snappymail.eu/
Cypht seems to be a similar solution where you selfhost a webserver that acts as a web client to external email providers - https://www.cypht.org/documentation/
I find nothing about push notifications for either of those solutions though, and I’m not sure about how much the webclients cache.

Ottimo lavoro di selfhosting! (translated from English, I dont’ speak italian)

Just a reminder, if you’re in the EU then waiting 'til June might be worthwhile:

Gonna be interesting to see which models disappear from EU altogether and which models get the better repairability and software updates next summer:
Ecodesign requirements will apply to mobile phones and tablets put on the EU market from 20 June 2025 onwards, including:

1. resistance to accidental drops or scratches and protection from dust and water
2. sufficiently durable batteries which can withstand at least 800 charge and discharge cycles while retaining at least 80% of their initial capacity
3. rules on disassembly and repair, including obligations for producers to make critical spare parts available within 5-10 working days, and for 7 years after the end of sales of the product model on the EU market
4. availability of operating system upgrades for longer periods (at least 5 years from the date of the end of placement on the market of the last unit of a product model)
5. non-discriminatory access for professional repairers to any software or firmware needed for the replacement

• https://energy-efficient-products.ec.europa.eu/product-list/smartphones-and-tablets_en