I use Cinnamon on my desktop too, but I do like KDE or more to the point I don't dislike it. I didn't care for it at first though because I was used to Gnome, it took some time getting comfortable before that impression faded. If you've given it a fair shot and just plain don't like it then you should use what you do like.
https://dev.to/fstanis/how-to-install-cinnamon-on-your-steam-deck-1boe
It's a little over 3 years old at this point but it's probably the same. Maybe reenable readonly after, that person skipped doing it.