C/Java interop is pretty painful still, and the tooling for native debugging in android studio is notoriously unreliable. (I hear it's better now, but I haven't had to get into those libs recently, so I can't say definitively. Last go round I had to roll Eclipse to debug ndk libs. Yeah. Eclipse.)

I think this may have been intended as sarcasm, but yeah man. I do C development for my real high performance mobile development. Everybody does. If you saw an app and wondered "Oh wow, that was cool, how did they do that?!", more often than not, somebody wrote some nasty old C/++.