The "HD Rumble" is a completely extraneous and unnecessary feature to the controllers, that alone tacks on probably a good $50 to the system, easily. But portability, being able to take the system on the go, is not a "gimmick", as others have already said. It's an incredibly useful feature. The battery life should be better, yes, but being able to take the exact same game you were playing on your couch, and continue it on a road trip? That's a huge plus. And if Nintendo eventually does the smart thing, and puts ALL of their resources into Switch, and drops the 3DS support, bringing those games and development effort over to ONE unified platform, that would be even more convenient.
I don't disagree that the Gamepad was never used to all that great effect, and they easily could have had just a regular controller (though NOT that crappy Wii U Pro Controller design they came up with). But at the same time, the Gamepad was NOT the reason the system failed, at all, and it was neat/convenient having a touch screen/second screen there. Off-TV gameplay for most games was a huge plus. The reasons Nintendo failed with Wii U have very little to do with the admittedly too-big controller.







