This is absolutely, 100% false. I don't want to get into the middle of this argument because I think it's silly, but this is just factually not true. There is not a single graphics engineer on the planet who would agree with you.
Generations plural? Like, 360 era? You're telling me that
Prime Remastered looks like
Quake 4? You think that
Breath of the Wild looks like
Skyrim? An engine that delivers physically based rendering with subsurface scattering, screen space ambient occlusion, global illumination, volumetric lighting?
You'd be hard pressed to find a 360/PS3 game that implements
one of these things, much less all of them. And yes, you are correct that Nintendo's hardware is closer to this generation in terms of horsepower. But doesn't that tell you something about the development team that they're delivering far more advanced graphics
at higher resolutions than the 360 era?
In terms of "generations" every advanced technique from the PS4/Xbox One era is bog-fucking-standard in a Nintendo Switch game. You could perhaps say that Nintendo's games are
one generation behind. But you know what,
the Switch is a 7 year old console. It came out in the last generation, it should be surprising that it's got last generation rendering techniques.
Of course, what ultra modern rendering tech is missing? Ray tracing? Sure, I guess, but show me the lengthy list of ray tracing titles on the 4 TFLOP Series S, and then we can discuss why Nintendo might not implement it on their 0.4 TFLOP hardware.
But their shared engine from
Switch Sports to
Tears of the Kingdom uses radiosity and probe based GI, basically "set it up just like you would for ray tracing" lighting engines, very similar to Lumen. The idea that Nintendo is afraid of ray tracing is silly.
Whatever you think about what Nintendo's whole deal is, that's all on you, but this is an overblown statement that demonstrates no working knowledge of graphical technology. "I don't like how Switch games look" is a reasonable statement. "NIntendo's graphics stack is multiple generations behind" is patently false.