Uabit on 19 February 2015
I would have discarded the gamepad from the beginning because it makes the machine more expensive and included the pro controller as the main controller. With the money they would have saved from not making the gamepad they could have made Wii U's processor more powerful (and if x86 better) because WiiU's CPU is really really slow and it even makes de console's OS to work slow while using apps like the eShop. It's a bottleneck.
Also developers would have appreciated some extra power and an x86 architecture to make easy porting games to the console.
