I think they're just have choice paralysis. There's too much stuff on Android, and picking something is really rather anoying.
Something like a Gallery. There's probably a 1000 galleries on Play Store, 50% of them are "my first app", that display a fullscreen ad every other photo.
You have to know what you want, research it, then get it. Non-nerds don't really care about that.
My guess. I'm a nerd who does care about all that.