If I was into mobile gaming the Steam Deck seems the best route. I just don't want to carry around a device that's only purpose is to play games that won't fit in a regular pocket.
Tried taking the Switch on the go, and it's a hassle. If im standing in the line at a grocery store, I can't pull a Switch out of my pocket and get any meaningful gaming in. Lots of my downtime is small moments like that on the go. The Switch hasn't left the dock since year 2 from when it launched. The battery is probably cooked.
Kinda sad that the DS/3DS never got replaced because at least that easily went in a pocket.