Ifrit with no Magic dps just requires melee dps to lb the nails, simple that is a DPS solution not a full party solution. That's 1 phase not the entire instance like this situation is.
You don't need LB for heart on titan if dps knows their rotation and is properly geared.

The thing about endgame content is there is little to no room for "Adaptation"/ Error
And didn't try to adapt? We ran it 2 times, the only other way of trading aggro as someone said "The rule of thumb would be to stop dpsind when you hit 2 stacks, jeiobi." that didn't happen.
DPS gates are DPS focused
Tanking is Tank focused
Healing is Healer focused
It's out of everyone's hands if someone in a role isn't doing their jobs there is no Adaptation to be had.

And this isn't the only instance I'm talking about.
There is a difference between learning a new boss and making the same error 4-5 times and not knowing rotations.