I still think the hopeless performance level of the wii u is a factor with it being beaten by ps3 and 360 versions of the same games despite the console being released something like 6 years later. The Switch comfortably beats the wii u despite being a portable at heart. The lack of hard drive meant many games simply didn't work that well on wii u and the weak cpu crippled the frame rates of many games. Much of Nintendo's own content was just regurgitating old games and it wasn't capable of running good versions of third party games. It was also very expensive for what it was a very cheap to make low performance console. The resistive screen gamepad was bulky and not particularly child friendly and had short battery life. Christ the more you think about it the more hopeless it was but still none of this matters when I'm playing Zelda BOTW.
The fact that Sony bought the factory that makes a critical component of the wii u and wouldn't continue supplying chips to Nintendo didn't help. Nintendo would have been forced into an expensive redesign of the console which was already struggling to sell. Instead they decided against lowering the price of the hardware and managing existing inventory of chips instead meaning they kept the console price high until they could replace the wii u with a new console. If the wii u had come down to a more realistic price point for the hardware on offer we just don't know how many more wii u's would have sold. So there were logistic factors too to wii u's failure.
Maybe that was a big factor why instead of custom chip in wii u Nintendo went with an off the shelf Tegra chip with no customisations for Switch.
