Most people/PUGs do
RUN SAM COR GEO BRD WHM
Run pops and tanks against a wall, brd, sam, or cor pull off one by one and fight out of AOE range.
Sam zergs everything. Last stage lullaby all the adds and buff, wind threnody/GEO silence main boss. Bolster fury/demat/geo runs away. SAM warding circles, SP2's and zerg.
Can get 1-2 runs in a row depending on Wild Card, but its dependent on SAMs SP2. So its a slow farm with SP resets
This is the setup my LS uses, but SMN is better than GEO in this fight, in my experience. Despite his level Tumult Curator doesn't have very high defense or evasion, and Perfect Defense adds a lot of consistency. You still get some offensive boost from Crimson Howl/Crystal Blessing/etc. Can also use paladin and Rampart instead of One for All.
OP the fight is rather daunting to approach initially but if you have a good samurai and the right buffs it's not too bad. It took my group a while to get comfortable with it. Pulling the chariots and HNMs in the right order and spreading out during the final phase are the big things.