name 1 part in coil where you need a higher HP pool as a dps/healer

(hint, you can't)

the only use for a higher HP pool in coil is so you don't come come close to being one shot when you mess up (like a bad) and get hit by caduceus tail whip/ads laser

for everything else, more HP doesn't make a difference. that full set of gear might look shiny, but realistically it is very little DPS improvement over darklight, especially when you consider that the most difficult DPS check currently, turn 4, can be cleared by people in AK gear.