Yeah, our football players don't do them either.
If I were the coach I would certainly have them doing them off season though. Since deadlifts are the most intensive exercise, using the largst number of muscles, they are the best way to gain mass.
I remember reading somewhere that the average college lineman today is much heavier and significantly weaker than in 1985.
Can't remember the exact stats, btu basically, they're all a bunch of teddy bears.