Actually it changes everything.
If you are not doing enough DPS against the enemy you could switch a tank to DPS or a Support to DPS. A forced 2 / 2 / 2 is obiviously not possible. Meaning only heroes that can counter 2 tanks and out burst 2 healers would ever get picked.
Probably be roughly 500% worse by conserative estimate.
Imagine if both DPS players decide to go Sniper?
Now 2 tanks can’t switch, 2 healers can’t switch.
Currently a tank or healer could switch to another class to compensate - which can’t happen in a 2 / 2 / 2
Again common sense.
Also do you know what people will demand after 2 / 2 /2 fails terribly?
"Make sure only 1 DPS can only be 1 flanker or 1 sniper.
Then you know what will happen when that fails?
Make sure every Tank has at least 1 shield tank.
Do you know whats going to happen when that fails?
Make sure 1 healer is a main healer.
The obivious consequences of their choices is plain as day. Yet because of how unaware they are they can’t see it.
While 2 healers maybe in the majority the 2 healers can currently flex on demand if the situation arrises to another Tank or DPS if they are under performing.
That is what Overwatch is about. Switching Heros to compensate for the weakness of the build. Once 2 / 2 /2 there is no more room for real compensation.
This of course would not be the case if Blizzard believed in Hybrid classes. But we know they don’t because they nerfed D.Va damage and Brigettes Damage.
Currently sym has a chance to win with a 3 DPS setup.
Because she complements DPS players really well. With a 2 / 2 / 2 setup her kit is so terrible it is aboslutetly useless as an individual DPS hero.
She does not provide enough DPS to the table to counter tanks, nor do her turrets cool down useful enough to counter flankers.
Meaning her win rate would soon become the first hero to reach <10%.
Which in a way would be good so Developers can actually buff her so she can be independently useful.
You are right 2/2/2 supporters are deperate to add credibility.
Because they literally have none.