I personally believe that they should because limiting subs will show the abilities of a player to perform for a full 80-90 minutes of a game. Subs, when they are not limited will depend on the coach whether if he is willing to sub or not. If he doesn't, the other coach has the opportunity to keep totally fresh players on the field for the whole game. Unfair, in a way i think so.
What is your view on it ?
