True, you should back up to avoid some strange edge case, but Apple markets itself as the company that makes using computers simpler and claims it works with th

True, you should back up to avoid some strange edge case, but Apple markets itself as the company that makes using computers simpler and claims it works with the model. As a user I'd expect at the very least it not to systematically fail on a model that is intended to work. Also completely rolling back is much more difficult with the whole closed system issue (which is something users accept in return of simplicity), it's not like getting Ubuntu 18.04 LTS .