Vit isn't irrelevant. That's a disingenuous statement. It's just less relevant after a certain point (hp meta). If vit were irrelevant then pentamelds wouldn't be bis. even at this point you arn't going into A3S or A4S with a full slaying set and expecting to clear. So vit very much does have value up to a certain point, but after that it losses value.

Personally I like the gearing options for tanks. It's the only role that has some variables when it comes to gearing outside of just mindlessly picking the highest ilvl and meeting an acc cap.