What also doesn't help is that people are way to nice. I remember doing Sastasha at release as a Tank and I was horrible.
My group chew me out even though I said I was new, which made me want get better fast xD
Not saying that was the good way to handle a sprout tank, but every is so overly sweet in this game.
If you say anything to someone someone will probably come to their defence and say be nice, it doesn't matter etc even in high level content, or the bad player will gets super defensive, even if you say something like please use your cooldowns Tank.
You rarely get responded to with sorry and improvement.