What could possibly go wrong.
A neighbor’s boat engine got stuck and it went round and round and round and round. He was lucky to jump out without it coming around onto him. Thankfully, the water was calm so it didn’t crash into anything. It finally ran out of gas.
I was on an old LPD, they were always have trouble making steam.
If something breaks on a robotic ship does it sit somewhere for weeks waiting for a repair crew? I don’t think they will have self repairing ships in the foreseeable future.