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.
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.