Because Six-sided Star sets your GCD loop on double cooldown, which implies it to be a disengage ability. It is a DPS loss in all cases except:
- When the boss goes into phase transition.
- When you plan to disengage from melee range for at least 5 seconds.
- When you plan to use Limit Break next.
- When this is the last GCD in the fight.
Miqobot doesn’t know when a phase transition is going to happen and doesn’t know about your intentions. Therefore she has no tools to identify the correct moment to use Six-Sided Star. Since you are the only one to know when you are going to disengage, you have to use this action manually.