I think it will be interesting to see how SE handles the diversity of humans.

I have done 17 duties. 2 of them had a tank that tanked more than one mob. I've had tanks afk in the very beginning multiple times, and I've had the great experience of kiting 2-3 mobs around like a restarts so my healer has a chance to live. It's very frustrating, but after waiting 2 hours, it's the cats that were dealt. Long story short, it's hard to control how people handle frustrating situations.