For Pog, I would definitely rate one MSR more highly than another Lombardia or Liege, because it's just a slap in the face of all the fast men whereas we don't need another reminder that he's still the best 1 day climber.
I mean, to win Lombardia you only have to be a little bit better than the next best climber. But to win MSR as a climber, you probably have to be head and shoulders better than anyone else. So to some extent, "versatility" is actually a way of demonstrating utter dominance.
But if Pog never wins GW then it's probably a knock on GW, not on his palmares.