CRDTs make sure there is only one version, but that version might be garbage. Think taking all the lines from all conflicts in git. Sometimes it's ok, sometimes not. It's even worse than that: you don't know there was a conflict, so you don't know if there was a problem or not. It's trying to solve social problems with technology, it's never enough (but can bring us a good way there)

Manual merging is mandatory to have human meaning, so might as well use it all the time.