This is almost completely true, but I would add the caveat that PWAs (progressive web apps) are not as easy to discover and less familiar to install as an app in an app/play store. It might also be because it’s in Apple and Google’s best interest to not streamline that. But it’s still an obstacle nevertheless.

Aegis on Android is also very nice (and open source).

Working development system. I got quite far, but after so much work, became very frustrated when a VSCode plugin wouldn’t work properly because it needed (and assumed) read/write access. I didn’t want to have to manage and think about every little plugin I experimented with at the OS level.

I really wanted to like NixOS (and I do, theoretically), but I couldn’t dedicate more than 5 full days over Christmas to learn how to get to a working development system.

Check out Aegis if you’re on Android. (See my other comment).

On Android, I replaced Authy with the open-source Aegis app. It’s just as functional, allows exporting, and doesn’t tie your data to your phone number (nor store it on a central system–not sure if Authy does this or not).