I prefer SteamOS although I have tried installing Windows 11 on an SD card for the sole purpose of playing Genshin Impact on it but that didn't quite work out since the SD card I bought for that was too small to fit Genshin Impact beside Windows 11 on it. (128GB) But just installing Windows 11 went pretty smoothly.
Windows (10 - I haven't checked 11) alone takes over 20 GiB. That's right after running the installer, before the installation of any additional user software.
On the cheapest Steam Deck that would already fill about 1/3 of the internal storage, not counting any space for temporary files, the swap file, etc.
(Not that SteamOS would be much lighter. Afaik it takes up a 5 GB partition on the Deck, with a second 5 GB partition that's used as a fallback during updates.)
If I were to try Windows I would definitely go with one of those super optimized installs that are like 3-4 gigs. Unless that breaks some of the DirectX functionality for games?
Wow, I wasn't aware those exist. After a quick online search I'm quite impressed how much space modders were able to free compared to a vanilla Windows install. While I don't seriously consider putting Windows on the Steam Deck, I'll definitely use those images next time I need to set up a Windows VM.
Yeah, I haven't used Windows in years (not much of a PC gamer, I mostly play on consoles until I got my SD) and the more I read about Windows 11 and the bloat and telemetry the more I hated it. But I'm impressed how much they managed to shrink it into Tiny11 and might be tempted to experiment with it on a virtual machine.
Unless something has change a ban is very unlikely - I used to use it all the time over the course of a year or two.
In any case you could always create a new account under a different email address to play. If you don't get banned in a year, you're probably fine.
Also people usually report if they get banned, and the Devs do what they can to trace it. I vaguely remember that the last time.i looked there was a note of "no reported bans in over a year"