Pixel changes the navigation mode to gesture only by default. You can go and turn that back to three button mode and it is pretty successful, If you know it’s there.

I find Samsung’s one UI implementation to be dodgy when apps go full screen sometimes it doesn’t like to stay on, sometimes when apps come out of autohide there’s a race condition and the app will appear over the bar rendering it unselectable. That bugs been there for years. It’s also irritating that the button positions on vanilla and one UI are backward of each other.