You're right about the power but not the controller.
It's not rocket science. The console is not powerful enough or similar enough (weird controller) to compete on a like-for-like basis with other future consoles.
So it has to compete on its own terms. And that means having lots of good games that you can't get on other consoles.
It's ridiculously simple, and mind-numbingly obvious to everyone apart from apparently, Nintendo.
A version of Tomb Raider or Bioshock Infinite could have been released with zero or minimal screen use and Wii U Pro Pad support.
If you ignore the screen the controller is just like the others.
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