Cause they are called enforcers and being phased out of the league?
Sorry, I just want some context because if someone is going to be on the ice 18+ minutes per night, I have to expect that they would be just as comfortable fore-checking as they are playing the half-wall on the PP, or any sort of game situation that would be considered opposites of each other.
The pitcher who throws gas, but can't have a solid 2nd or 3rd pitch gets relegated as a closer instead of being a dependable rotation starter. The small forward who is great at shooting 3s but lacks a lot of inside game and shot creation will be of value, but never elite (think Kyle Korver, for the NBA fans out there).
Otherwise, you only have a player who can contribute in one area, and over time, that player would either seem to be phased out in the sport in some way or never produce to a desired level, no?