I see PRODs get removed too often without any reason for the removal being stated. That's behavior that should be stomped out somehow. Not in a punitive way, but we should still get rid of it.
The burden of proof is on the person wanting it deleted, not on the person wanting it kept. The entire principle of PROD is that only completely uncontroversial articles should be deleted without discussion - if someone has removed the PROD, for whatever reason, the deletion is controversial, and should be discussed fully.