Linux

You don't lose any control, at least not in Silverblue. You are free to edit your base image and layer stuff on top of it if you wish just like any other distro. All it does is create a separate "branch" off of the ostree. It does defeat the purpose of an immutable OS though, the idea is to keep your base system as "clean" as possible so there's less surface area for bugs. But you can do it.