Well, one could make the argument that the postseason shouldn't be taken with as much weight because guys like Bert Blyleven toiled in obscurity on really bad teams and never got the chance to prove himself in the postseason.
I don't put so much weight on it because baseball, above any other game, has so much variance across eras, ballparks, etc. that it doesn't make much sense to penalize someone whose team played in the postseason when another didn't.
I think Schilling is a HoF, not first ballot, but he'll get in.