@Tourma

1. I think some may, especially ones on F-Droid. The one I use (Nova Launcher) does not.

2. You can swap back and forth, and I did a lot initially, but generally I think the idea is for a custom launcher to replace the vanilla one.

3. Again I think it depends on the launcher, but the one I use works fine on my Pixel 8, which runs vanilla Android.

4. I don't think so unless it requires root.

5. Sure!