StevoJH
The Bunker Group
I think the issue (at least in peacetime) is probably regulatory rather than technological.I am personally of the view that the optionally crewed/low crewed concept will be leap frogged and is an obsolete technology. We seem happy to automate aircraft and allow drone submarines to travel by themselves for 1,000 kms, but not for surface vessels. Doesn't make sense to me. I personally have my money on Defiance style platforms winning the day here.
COLREGS and maybe SOLAS?
Plus the risk of an armed non-crewed platform falling into the wrong hands when transiting a choke point wouldn't be a good look.