I don't think any sane person felt mario kart on wii u was technically impressive especially with the horrible aliasing and simple repeated textures but still a very beautiful game.
I still think the NX may have more cpu power and possibly high memory bandwidth but a weaker gpu than xbone or ps4. This gives it the ability to run all ps4 games, even add some more gameplay elements even if it can't match the visual presentation of ps4 or even xbone. The point already made that cartoon graphics require less resources is true if they don't need a realistic physics engine and texture and lighting is much more simplistic and more often repeated.
To be honest I've lost confidence in Nintendo and I'm unsure what the NX will be and whether I will want one. The wii and wii u have done a lot of damage for me with regard Nintendo's ability to release a competitive product capable of providing the games I want to play.
