Not true. The snes was build to be a competitor. Its mode 7 was marketed to death, even its ability to use expansion chips to deliver better visuals.The nature of the 64 was the development of true 3d enviroments and to deliver nice visuals and gameplay. The gamecube didnt happen to just be a little powerful than the ps2, it was developed to be a competitor.
Take your glass off for once. There was a time nintendo cared for power, but sadly it wasnt working for them since the competiton was always ahead of them with machines with less power than theirs. That's why they hugely focused on delivering a gameplay changer with the wii, and that's also why the wii is just a glorfied gamecube with motion controls. That's why the wii u is slight powerful than the ps3, they focused too much on the controller (but this time it failed horribly). That's why the also took the wii u concept and made a hybrid handheld.
Also, your comparision is a bit, lacking... Sony studios could perfectly deliver 60 fps games, if nintendo can on non powerful hardware, why sony couldnt on a more powerful one? They focus on visuals. Too much for the liking of some people. Why nintendo can deliver 60 fps games? See their visuals and tech... odyssey isnt impressive, nor isnt smash or splatoon (in term of visuals/graphics, i like to play them by the way). Then you have botw which is 30fps, xenoblade 2 which is 30fps with frame drops and 360p in some areas on handheld mode... dont want to talk about third party stuff with blurry visuals and frame drops...
And three generations? WHAT? They just started hd development on the previous gen... what in the actual fuck.