Isn't the state (apps' data in this case) the biggest problem with updates of any kind? State can't be immutable and is the easiest to break. I can certainly s

Isn't the state (apps' data in this case) the biggest problem with updates of any kind? State can't be immutable and is the easiest to break. I can certainly see how containerizing apps and using "layered" FS solves a class of problems, but I highly doubt this alone would be incentive enough for the major OSes to go that way. I do agree it would be neat to see such developments, though.