The ROG Ally, and every other handheld PC outside of the Steam Deck has the issue of not being battery efficient enough while also running Windows on top of that, which is hot fucking trash for anything that isn't just an office workstation.

Personally sold my Switch because I barely used it outside a few first-party games and the occasional JRPG without a PC port. Got tired of micromanaging HDMI nonsense on my monitor, poor performance, and having to update Hekate and the sigpatches if I want to dump a ROM backup of my games.