Soundwave on 19 December 2016
I think basically Nintendo's R&D continued working around the Wii U as a target after the Wii U was completed (remember "absorbing the Wii U").
So their target was always "can we get Wii U performance in a portable so we can bring games like Splatoon to our main audience on handheld".
And Nvidia said "yeah, we got a boat load of these Maxwell Tegra X1 chips that went no where, they can be downclocked and tweaked for your needs and we'll give 'em to you for dirt cheap."
Bingo, bango, bongo ... you got a deal.
