Overwatch caster ZP has called for a hard lock on the roster composition in Overwatch. The best way to play the game is always with 2 heroes from each class. It presents a beautiful picture for the viewers as well as casters. But there is no rule saying that there should be 2 heroes of each class.
Brigitte also raises another long argued point. I've held that Overwatch has historically been at it's best to watch & play when 2/2/2 is standard. Triple / Quad tank gets old quickly much as triple DPS did. If triple support isn't loved, it builds the case for 2/2/2 hard lock.
— Andrew Rush (@TempoZP) May 1, 2018