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You can pair your XBox or Playstation controller with an iPad.

Also keyboard and mouse!

Those are terrible controls for most of games.

You can pair a mouse and keyboard with an iPad too. You can even plug them in…

Only for RTS, most other games actually favor the controller due to the included aim assist in FPS games, for example.

Having to be on console makes pretty much any game controller compliant.

If they were a good kind of controls they would not require an "assist".