Because the NFL may want to take the game in a direction away from this sort of game. Look at the way pass interference is called nowadays. Not that they should, but that might be their rationale. The elements belong in football--I loved watching the sheltered Saints fail to adjust to the wintry Chicago lakefront--but srsly, city of Pittsburgh, move your buttfucking HIGH SCHOOL FOOTBALL games somewhere else.
Also, thanks Marvin, for taking a discussion of artificial turf and tangentially relating it to the Baltimore Ravens. Neva' change.
KingPK mentioned Gillette Field having crappy turf and the ravens game there a couple years ago in 3 or 4 inches of mud is a good example of that.