This question already has an answer here:
I was thinking why there would be crew on a space warships when everything can be automated by even basic AI.
Without crew you can pull all the gees you want with your torch-drive and no need for artificial gravity centrifuges. I thought about maybe dozens of auto-warship frigates and destroyers around a single flagship with crew controlling the different groups of warships meanwhile all the ships provide protection and point defense for the flagship.
So is there really a need for crew on space warships as depicted in many military-science fiction stories? Just slap a fusion drive down with a bank of thermonuclear warheads completely covered by CIWS and laser point defense and coil guns.
When the light-lag gets too long just let the AI take over, it'll probably even do better than the flagship crew anyways. Maybe the warships can even deploy mirrors to protect the flagship from the incoming laser fire. I can't find a real reason for crew apart for maybe repair and just in general story telling. I mean it does provide for some awesome war stories.