So like I was saying, I think Mei should be moved to the Tank class.
Not because she needs any big changes, but because she already performs very well in the offtank role. Especially if they fixed her Iceblock bug, she already has effectively 400hp.
But the other one is trying to “game theory” kill thirsty players into choosing heroes that can block ultimates. I.e. Mei/Dva in a RoleQueue.
Such that if you got a Genji, Hanzo, Mei, Dva, OffHeal, MainHeal in a lower rank game, even if you don’t have a shield tank, your team can block every ultimate in the game.
Also, because this RoleQueue system lacks a “TripleDPS” option, it would soften the restriction a bit.
(Although if 4 players want to unlock roles, there’s that too).
P.S. It would be nice if they reduced the 0.5sec where her ultimate can get stunned/killed, to compensate for lag.