I do play tank, and I have issues with some of your points. Namely
And pretty much anything that amounts to “this character makes playing tanks miserable”. I’m seeing a weird notion that everyone who counters tanks should be nerfed, but I’ll ask you guys a simple question: how much fun would you have if all the tank counters were nerfed? When widow’s counters were nerfed and literally deleted, people hated it for one reason: it left widow largely uncontested. Are we really going to repeat that?
So, I’m okay with tanks dramatically resisting CC, but I think things that does extra damage to tanks are important. Especially since tanks can block that extra damage outright.
I think claims like “Zen basically takes 100+ health from a tank when he puts discord on them!” which is technically true depending on how you think about it, is said to alarm people. Its catastrophizing, and reads similar to “Reinhardt effectively has 1500 health if he has his barrier up at you”. Its said to get people to say “What?! He shouldn’t have 1500 health! Take half his barrier health away!” or something.