What about motion control games like Switch Sports?
I'm sure the emulators accept the Steam Deck's own accelerometer inputs for when you're in a non-detached mode, and tilting the screen to aim.
The super-mega-motion control games might not work, but part of what I mean by "works better" is that the Steam Deck can generally emulate with more power than the Switch itself, e.g., you can get a Breath of the Wild/Tears of the Kingdom setup with a better framerate than the switch itself, so, depends on what you want more. I don't have a lot of motion control games.
For ToTK in particular, this video suggests it'll barely hit ~30FPS on the Deck under Yuzu: https://www.youtube.com/watch?v=afetsBdQFyc
Whereas on a modded Switch you can run it at ~60FPS: https://www.youtube.com/watch?v=i6Z6W_AUNY0
There are other more recent videos backing this up and showing that the game has far more frequent stutters than on the Switch.
Anyway, the point is, I wouldn't dismiss sticking a picofly into your Switch as pointless. Even if you have no desire to inflict some Meta-style "fair use" on videogame publishers, it's still worth doing for perks like sys-clk, RetroArch, sm64nx and 2s2h.
A software engineer can (temporarily) get it working after hours of diagnosis.
Compare that to the switch.
While I wouldn't pin this on Steam qua Steam as a program, it is a fair complaint about the ecosystem. I have some games that are as flexible as the Switch about being docked. I have some games that can be docked but can't handle any resolution changes. I have some games you just plain can't switch. I have some games that you can switch from using the physical Steam Deck controls to an Xbox controller seamlessly, complete with the in-game hint graphics changing to match the controller in use. I have some games that have to be restarted to pick up a new controller. At least a few months ago I had one particular combination of games that if I played them in sequence would somehow permanently render XBox controllers non-functional until I rebooted the Steam Deck, though that is certainly an exception.
The Switch does handle the Switch-ing in the Switch name better than the Steam Deck, and it is a structural advantage that Valve will have a hard time addressing in a practical way. That said, my family does use the Steam Deck as a de facto Switch 1.5, as a thing that is used fairly evenly between "docked" and "in hand", and it is functional enough to work, even if it is undeniably not as slick.