They have such absurd sustained damage that you can’t just shove a tank into their face and kill them while your tank is being a menace, 'cause your tank just dies. They melt shields, Mei walls and etc. 76 and Reaper have healing, so they just straight up win most duels.
What are you even supposed to do? In ancient history your off tank would handle them, but we don’t have those anymore.
Sombra deletes Bastion so fast it’s not even funny. And a decent Ashe is great against 76, sometimes you don’t even need 🧨