Post Secret Wars, his average isn't exactly "millions of times more powerful than MU combined", he lost against MM, in a thor annual issue it suggests that his power is nowhere near abstracts, then we have him being dwarfed by the celestials, yet again being defeated by thanos in the maker form (though that was only a small part of his power), and finally we have the inhuman mutant retcon.
As for this thread: i think the op is making progress, i mean...it's still better than PR beyonder vs PC superman, right?