I’m not familiar with this app, but what do you mean “gnomed”? Do you mean the UI started using Gtk4 and Adwaita components?
Gtk3 is considered legacy now, so most apps that use Gtk will be transitioning to Gtk4 (and Adwaita) at some point. Gtk3 is starting to look a bit outdated in modern DEs.




That’s true, however the GNOME maintainers will drop support for it at some point. I guess Cinnamon or xfce could maintain their own forks, however the majority of apps target what GNOME is currently using given it’s the most popular desktop environment.