It's more about FEX + ARM handhelds, than those in isolation. Only in the last few years has FEX started to become viable, and more and more Linux ARM handhelds (not Android) are starting to appear.

The Switch represents a floor of what is possible, with weak hardware, unofficial Linux support, and likely poor GPU drivers. ARM handhelds that aren't Android may have better long term support, and will become closer to the experience of a Steam Deck (albeit slower), at a much lower price.