I am lead to believe that there are a slew of causal players that have been carried most of way through the game and think nothing of it. I'm guilty of carrying an FC mate through keeper of the lake before the expansion as she repeated refused to avoid any of the bosses AoE attacks. After 3 wipes, I just made sure she had a stoneskin and adlo on at all times. I still have the recording of the run on my PS4.
There were people that have never done coils so when mechanics like towers from T13 appeared in the final story fight, they were clueless.