How does the Steam Deck handle other distros / recommendations?

So, basically, I kinda don't like very much to have an immutable distro, there are things I don't really like about steam OS but the immutability makes it so if can't really change it, for starters, I kinda don't like at all dolphin, and would prefer to use nemo, but is my understanding that next time valve pushes an update, all it would revert.

So I was wondering what other options for distros there is, that are not immutable, that allows me to not loose any basic functionality is possible, things like gamescope, and how the keyboard works with the touchpads.

Advice would be appreciated.