OOTP is a managers game. In this game, the players aren't the focus—the manager is. So of course people don't want the DH, because that gives the manager less to do. No one is paying forty bucks to sit around and watch games unfold without putting their big ol' thumbprint all over the thing.
In real life, though, I prefer the DH to pitchers hitting, because I think the DH game makes for a better and more honest game.