There are plenty of supposed Steam Deck killers available in the portable gaming space, from the Asus ROG Ally to the Lenovo Legion Go and all the Ayaneo and ONEXPLAYER devices in between. But none of them have managed to outright slay the dragon that is the mighty Steam Deck yet.
For some people yeah. I just want a portable Windows PC that I can game with so something like the Ally is perfect for me. I also play a lot of games on Game Pass.