So I went to an Underrot and the third boss has that mechanic that the cone damage of the boss has to break some mushrooms and I figured out that as a tank if you are not immediately in front of them but even further front the cone becomes obviously bigger since it's a ...cone and it's proven by the fact 2 big batches can break at once that way succesfully so it's pretty optimal that way.
Now after the rest of the group failed to soak the rest of the mushrooms they blamed me because in their mind the tank has to do the mushrooms (and seeing the tank in the middle of the room looked wrong to them) but they can also help with a debuff but they did nothing.
So not only they failed they even blame others because in their mind the "META" was not followed perfectly and they found an excuse to shed responsibility (I know in similar mechanics a tank can soak with CDs to overcome failure but that's still their failure)