A combat doll is simply a vessel containing barely restrained urges, and it won’t hesitate to let those loose when commanded. Ever seen one go feral on its witch? It’s a good thing they’re functionally immortal.
The dolls have a bloodlust in more than just a murderous way, and you do not want to interrupt them in that state, lest you become the object of their entertainment.
Even augmented humans won’t stand up to a doll’s unrestrained strength, much less their biting or their knives, and the maintenance crew does not want to scrape you off the hangar floor.