I haven’t played Overwatch for a while but for a time there was a notorious meta called GOATS (3 tanks, 3 supports). It was an insanely aggressive meta that focused on rushing straight into the enemy team, tanking them, and killing them before they can react. The only way you can counter it is by also running the same team comp and hoping to kill them faster.

It ruined ranked games for a few months and the devs apparently had no idea how to fix it without nerfing tanks or supports hard - which would make playing them feel terrible. That’s why OW added a role queue and enforced 2 damage, 2 tank, 2 support teams.