For one, I can actually use gesture controls without constantly triggering backswipes. Even something as droll and first party as Google Photos suffers this problem, where, say, cropping a photo and pulling too close from the screen edge will result in a backswipe detection instead.

Another example is Sonos, where the iOS app contains TruePlay to tune your speakers. They can do this because there is relatively few iPhone models (microphones). But this is a general, noticeable trend, where developers will add more / better / polished features to the iOS app.