New damage tank trend in km3

[Oursizes]

If any of you have ever run a km3 pug with tanks, you will know exactly what I'm saying. I mean, there's been tanks in km3 using horn once before the timer starts, and then never using it for the rest of the run. In some pugs I've seen people die left and right because the "tank" was too busy using a pvp build for a pve map. Worst of all is many of them were well geared, as in at least a mythic weapon, at most maxed out. Yes I do know that many came from auto leveling, but still what's up with this? It's very irritating seeing a tank run into a group of 10 skeletons or so and spam axe and charged normal attacks while the dps gets swarmed by 50 skeletons 2 feet ahead and dies. Any thoughts on this new trend? NOTE: these observations were from some pug groups,not guild/friend made parties.