On top of this, I doubt many of the Steam Deck’s current competitors could have sold at a loss like Valve did (IIRC, they sold at a loss or at least pretty close to it). Microsoft, however, definitely has the spare money as a larger corp if they decided to really back the XBox/Gaming division. Price-wise, they could compete. If they’re in the same pricing ballpark, manage a reasonable quality handheld, and can promise perfect windows compatibility with games, that might be something.
If I may recommend it, give Symfonium a try for an app front end. It’s actually stellar. I tried Finamp with the same and wasn’t as jazzed