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.
Yes, but my personal determination to put Linux on every device I own isn’t going to have an impact on market share and convince gamers that they don’t need windows.
Handheld PCs are a growing market and Valve has (had?) a chance to make SteamOS the handheld gaming OS.