MNK PoV Here.
This was amazing. This is by far the hardest fight this game has put out yet, for all roles. This group used to laugh at DPS checks, having cleared T9 for the first time with over a minute to spare. This fight however, we spent an entire night getting sub 5% attempts. We talked things over, crafted up some strength accessories for our Warrior, made a new strategy to let myself (Nin) sit on boss for P2, as well as more Foe Req. All that combined gave us a kill after just 1 hour worth of attempts (some embarrassing) on the following night.
Tanks play a huge role in this encounter as well - 1 mistake from them in the last phase is a potential wipe since they are responsible for taking Twisters off the DPS/Healers. The damage in this fight was also bad enough to make our PLD stack parry for the first time ever,
Healers had it the worst of all. They had to heal every mechanic which quite clearly is not tuned for the gear we were fighting it in. Almost every mechanic during the last phase would leave us sub 10% health. There actually was a pull a little before this kill where I got 1 shot from just damage while standing in a Sacred Soil. They've carried us through every fight thus far, and they continued to carry us once more.
All in all, this was a very challenging fight. It took us ~22 hours worth of progression to clear, and it was well worth it. I look forward to more fights like this one. Also, I love you guys.
With Coil out of the way, now we move on to the real end-game: