Watching the video is tech: John Carmack(from the video): This is in now way replacement for highly sophisticated apps... ...you should clearly be using Unity

Watching the video is tech: John Carmack(from the video): This is in now way replacement for highly sophisticated apps... ...you should clearly be using Unity or Unreal, you should be using a real game engine. If you have to do a lot of interaction with Java or native code, you should be writing a native application.