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.
PC is always a bit more complicated to use than a console. You have to deal with minimum requirements, graphics settings, drivers, troubleshooting, and such. I view PC as platform that takes more effort, but can give the best experience when everything’s right.