Gimmick features in general. So many android phones are just designed to be android flavors of an iPhone, removing all the character that used to be one of the benefits of not going with Apple.

I had a phone that had a built in kickstand. It was both useful for propping the phone up and as a fidget toy. My last phone had a camera that would pop up out of the top of the phone so they could put a better camera for the selfie cam while also not having a hole in the screen.