Ever since its appearance in Android Pie, I always consider 2 button navigation is a bad attempt by Google trying to play catch-up with the fad generated by the iPhone X. However, due to a bug with A13 QPR2 it had to be temporarily removed and many were not happy about this. So, 2 button navigation users, may I ask why do you prefer this method? To me it makes you do more for the same action whilst doesn’t save any screen space.
It was nice because it was distinct from Apple’s implementation and worked with drawers. It felt like for Android 10, they polled a bunch of already-familiar iOS users to see what gestures felt right.