Immutable base image also reduces chances of software that’s not malware unintentionally screwing things up or putting files in places it has no business puttin

Immutable base image also reduces chances of software that’s not malware unintentionally screwing things up or putting files in places it has no business putting them (as Adobe loves to do). macOS obviously has its desktop environment as part of the image, which makes it difficult to accidentally destroy your desktop environment, is that true of SteamOS too? Seems like it’d be smart if the immutable image at least included a minimal fallback like IceWM or something that it spins up if say the package manager loses its marbles while resolving dependencies or something and eats the stock KDE install.