Level 60 unsynced dungeons need adjusting. (Including the two newest)

[Sandpark]

I think that interview was speaking of players entering at 210. If you completed raids before these dungeons you were already above that. As for the mass pull thing, enemy HP boost and defense would make that less likely but doesn't get to the root of the issue.

Which is tanks need good defense so they can tank the bosses. They shouldn't be able to tank whole portions of zones or that is broken. To remedy this and not make content take inherently longer. I would implement attribute status called brittle.

Brittle: Taking damage from multiple enemies affects a threshold. When a tank receives incoming damage from multiple sources, and surpasses the threshold, brittle status is inflicted. Brittle, lowers HP, Magic Defense and Defense by X amount until active enemies are defeated, most likely resulting in the tanks death.

This threshold would be determined by SE say 3-8 enemies for an example.

Allowing tanks to tank 15-40 monsters is like allowing a DPS to spam AOE until 40 monsters are dead.