I am still in the 11-13 bracket so I cannot speak for higher keys. I did something like 30 runs 11-13, half of them failed, each one for their own reasons.
I usually don’t blame anyone because I don’t get mad if a key fails regardless who is that failed, I only reply if someone blames me for no reasons.
No reasons is usually random dps taking tons of damage in 3 seconds, dying and then blaming me by typing “do we have a healer?” that unfortunately happens more than it should, at least in “my” bracket.
Of course I make my mistakes but I usually write “my bad” and it all ends there. Don’t know why it’s so difficult for ppl to admit they made a mistake and start blaming others, no one is going to burn down your house my friend, just chill.