What people dislike about Wii U hardware?

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Illusion said:

In fact, I believe that Nintendo released games like Smash, Splatoon, Mario Maker and maybe even Mario Kart with the expectation that they would get re-released on the Switch in order to make the investment in the game's development profitable for the company because the Wii U's paltry base was not enough to accomplish this by itself.

Smash, Splatoon, and Mario Maker didn't get re-released on Switch though, they got sequels instead.