Starting in August, installing APKs from unverified developers will require a new procedure called Advanced Flow. It involves enabling developer mode, rebooting the device, and waiting 24 hours with biometric verification.
After that, you choose: allow the APK installation for 7 days or indefinitely. The procedure is a one-time process and applies to all versions of Android.
Will the 24-hour wait stop you from installing APKs outside the store?
Yes it is. Their entire vendor shit can go to hell. I don’t need a Samsung app-store, Samsung photos, Samsung parental controls etc. on a cheap phone that already has Google’s versions of the same crap. It’s like having 2 operating systems in constant conflict on the same phone, and the only real purpose is for Samsung to collect your data.