Yeah. You can layer it like a git repo fork layers it’s changes. If something breaks you can just clear that forked branch and redo it. Takes like 2 minutes to fix.

So yeah you can alter system files in a very safe way and can easily revert changes if you don’t like the result. rpm-ostree reset is the command that clears all changes and resets to master. I’d recommend looking at the rpm-ostree docs for a full explanation of functionality