I do not recall SMTV being particularly bad on the Switch either although I've played around its release in 2021, so it's been a while.
Assuming the leak ends up being true, there should be a PC port of SMTV later on this year.
The point was that neither the Switch and Steam Deck are good options for someone who prioritize framerate and/or graphic quality above else, as the form factor will force to make concessions either way. And I say that the Switch is still a capable machine as it's one step below the PS4, like a mini portable version of it.