What is that supposed to teach anyone? poo tanks are poo and decent tanks are good enough but whiny and self absorbed? lol
Tank is a job where you cannot forget the fundamentals. You have to use them all the time. DPS and Healers have their logs and meters, but you don't need a third party application to tell that a tank sucks at doing their job. You have to be able to pick up these skills and use them to play a tank.
But you know what I think is fun? People trying to push their one-sided "poor me" stories on people and end up actually being given the impression by other players that their behavior is normal and that it is okay to start acting like a knot on a log just because something didn't go exactly the way that they wanted it to.
I don't think anyone who has ever processed that thought and attempted to demonstrate their teaching technique with it has ever really, truly, sincerely... felt like they taught anyone anything relevant.
Always try. View difficulty as a challenge. Strive to be better. There is nothing wrong with accepting that a challenge is too difficult for you to manage. But there is everything wrong with chasing a dog with a vacuum cleaner because you stepped in it's poo.