Just to add to your comment, you can already turn any phone to a "streaming Switch" for $30, there are dozens of controllers like this:

https://smile.amazon.co.uk/dp/B08BRX3RT3/

the Steam Link android app lets you stream any of your games to your phone like this already. With a little more setup you can stream Wii games to your phone through Moonlight from CEMU and run them at 1440p60, while the Switch can barely do 720p30.