I don't know that there is a barrier to the coach communicating tactics as it is. Without knowing that you can't assume extra breaks would have a positive influence.
Furthermore, fatigue over 45 minutes is seldom an issue. Barring Ox against AC Milan i've never really seen anything to indicate footballers would need an extra break. I also believe there would be a negative affect on muscles cooling, but i have no idea why i think that.
Lastly, it believe it would disrupt the flow of the game, and encourage more opportunities for taking the ball to the corner flag waiting for whistles. Etc.