Hardmode sparky the adds NEED to die fast, the stacks don't go away and you will melt.
Bulo: no
Torque: hardmode, turrets pop up on the panels and need to die fast as they can enrage
M&B: no
Cortani: no
Malaphar: the red circle doesn't one shot the adds in hardmode, need to be aoed down
SS: no
Underlurker: if a tank positions correctly you can hit the boss and two adds with AoE
Commanders: in hardmode adds enrage need to die ASAP especially in the burn phase since they don't stop spawning
Revan: no
So half the bosses