So, today the unthinkable happened: a party I was in wiped in Sastasha.
It was me, a returner, in leveling roulette as THM with a GLD, a CNJ, and a PGL, all sprouts. I vould already tell the run was going to be a pain when the tank decided AOEs weren't for use except on single targets. Shortly before the first boss, I decided to speak up and mention that we'd clear faster if the tank used his AOE skill on groups. The tank's only response was to turn off his tank stance entirely only to turn it on and off again intermittently throughout the rest of the dungeon. I tried to address that as well, no response, no change. Sometime after the second boss, I tried to votekick the tank. It didn't take so we kept going, with no change in the tank's behavior. Finally, at the end, he bolts into the boss arena, ignoring the trio of mobs that are always guarding it, and gets us all killed because he can't be bothered to take their aggro off me. The tank is the only one who doesn't return to the dungeon entrance so I try the votekick again. This time it goes through and the tank is instantly replaced by a PLD who actually plays his role. The boss goes down in no time, just like it always does.
First time I've encountered a troll tank like that and I genuinely hope the experience is a one-off.