Let's add in Smash Ultimate in your examples for good measure since it's clearly an upgrade o Smash 4 and I'll be down to concede the question that the U had decent, deep games but still even then they got the deluxe treatment on the Switch which enriched then and made then deeper. And still, Switch took those and added more, with IPs like Pokemon that never made it to a Nintendo home console before (it's a hybrid).
So I guess the Switch not only had deep games, but it also included the deep games from the U and made then even deeper. It's an unstoppable combo.
The U only had it's own deep games and they were too few.
What do you make of the fact that you could at best go to the toilet with the gamepad? Imho that's a pretty huge design flaw.
Oh, I'd never argue that the WiiU was better than the Switch on any front, software or hardware. I just disagreed with your original sentiment that ZombiU was shovelware and then your reply that the WiiU didn't have good games. It did have good games, they were just too few and tethered to a hardware that was not good.
Although, I would argue that Smash Ultimate is not an 'upgrade' of Smash 4. The two are different games for a multitude of reasons. The only reason you seem to think they are the same is that the physics engine was changed slightly instead being utterly overhauled like between the previous titles in the series. That one difference does not a 'port' make.