Well maybe because I mostly play with a stack, where we always switches roles mid game to fit the situation because not everyone has a wide hero pool.
Also as far as I experienced, the match maker does not have a “hidden role queue” algorithm included, which means there is a decent chance that you have 3 mains of the same role (It’s possible to have more but those are more extreme).
I don’t know if you missed or ignored the rest of my reply. The situation you mentioned wouldn’t happen under a 1-3 restriction system, and it is so far the best compromise I can think of between stable team comp and flexibility.
I’m not a pro role lock/whatever you want to call it, but at the current rate, people will be happy seeing anything but GOATs on OWL. And losing viewers because you want to balance something isn’t something a business want.
Well, the only reason I think 2-2-2 isn’t the best idea, is because a 2HealersMaximum would be even easier with less balance concerns and more team comp variety.
And it would allow devs to focus on Healer balance, in a 2Healer meta.
And then worry about the easier DPS/Tank balance when they are getting ready for a full 2-2-2.