Ok but what if we dig deeper. What does an autonomous ship afford? The space and weight savings of having no human habitation (just mechanic/engineer access for

Ok but what if we dig deeper. What does an autonomous ship afford? The space and weight savings of having no human habitation (just mechanic/engineer access for equipment maintenance at dock) would be rather large. No need to maintain human-comfortable conditions, bring water and food for the voyage, no recreational areas, quarters, corridors, etc. In fact, the entire ship can be sealed and resealed at port so that if pirates board, they'd need plasma cutters. With no bridge, they'd need to hack the sheep instead of take over the crew.