I don't thinks it's any better for coins, comic books, baseball cards or anything else.
It's simply that we are stuck with it.
The whole purpose of slab free was to keep history from repeating itself

It has been proven many a time that if a coin is broken out of a slab and resubmitted even to the same grading company it could very well come back with a different grade and sometimes not even close to the original one
that alone should tell you something

Follow the link to get a better idea of what can happen