I would agree that the Switch's really big feature at this point is that it is where Nintendo games appear, and in that family-friendly-but-still-high-quality niche they are still worth chasing if you want them.

I don't know how you get from there to "games on steam are sub par quality" because at this point, everything else is on Steam, so calling the rest of the Steam library "sub par" is effectively calling the entire rest of the industry, from top to bottom, "sub par", and I'd have a hard time with that one. Nintendo has a pretty good track record but they're just one company. And not because I love AAA, I'm pretty much out of the AAA loop entirely at this point, but because it's literally everything else. In particular, the XBox exclusive and PS exclusives are, if not dead, on life support. PS may still have a sort of "Japanese game that doesn't appear on Steam" niche, but even that's getting eaten into; every major Atlus release lately is showing up on Steam as a first-class citizen, for instance.