No, Steam doesn't support arm. So my hacked Switch runs cobbled together emulationstation + xfce + antimicrox + onboard. I don't like Horizon OS and only SuperTuxKart works flawlessly on Android for me. In SuperTux, the sound desyncs from the game. Minetest doesn't support gamepads, and I couldn't find any Android alternative to AntiMircoX. I also just don't like how 99% of Android apps "need" Google Play Services.
Linux is what I need, but there isn't any decent interface that isn't SteamOS (x86 only) or RetroArch (everything must use libretro) or batocera.linux (their version of emulationstation completely shits itself when ran outside of batocera, and I really don't want to recompile batocera)
I still prefer having a "native" system menu over one that's being emulated.