I honestly don’t think many (if any) games on Switch are actually designed for traditional handheld use. Except maybe Pokemon, or similar series where handheld design is so baked into their formula that it can’t be separated out. Because the point of the Switch is that it isn’t a handheld — and thus doesn’t have the limitations that say the 3DS had. It’s not a handheld; it’s a TV console you can hold in your hands, that you can take with you, or just play on your bed (which, tbh, is where I’m usually playing it). Which is why you have a lot of people on say r/3DS who really dislike it. Design-wise it’s not trying to be a handheld console, and it really never has. I think, at this point in time, the “traditional handheld game design” space is mobile games, Apple Arcade, etc. Not the Switch.
But if you want what’s basically a low-end PC you can hold in your hands, there’s really nothing that comes close. Because that’s what the Switch is for me; it’s an indie machine, a much more comfortable way to play things like metroidvanias and platformers and weird little projects that would otherwise only exist on Steam, where I’d have to be sitting at my desk and staring at my monitor to play. It’s not a replacement for my other TV consoles as much as it is a) a replacement for the lower-end stuff I’d play on my PC and b) the thing I need to play Zelda, Mario, Pokemon, etc. I think it’s the best way to play Hollow Knight, or Hades, or Celeste, and the fact that it can also run Doom 2016 is like… really really cool, but not its main appeal.