That's ridiculous. They are (IMO) just trying to squeeze more money out of the people they certify, hence PADI = Put Another Dollar In. There is no reason whatsoever to try to restrict someone like my wife, who has a PADI OW cert and who has been diving for more than 20 years, to not go deeper than 60'. No reason other than trying to get more money from us, that is. I assure you that she is far more "advanced" than any diver with the minimum number of dives that PADI requires to get AOW certed, even after they get the cert.
When she was certified the "rule" was only a guideline. Thankfully, we have never had a dive op try to tell her she has to stay shallower than 60'. They would get an earful if they did.
The agency that certified me (PDIC) never tried to foist that crap on me.
There are no PADI police at the dive sites. It's more to the point that there's more liability to the dive companies if someone is taken past their training limits. BTW..., I looked up the PDIC website. They have two levels above open water training before you get to Rescue Diver certification. That's one more than PADI. All certification agencies are businesses first.