Large ships are eventually going to have to comply with redundant systems modeled on aviation. Multiple steering systems capable of full control at all times, including after multiple system failures. Steering that works no matter what mode the propulsion system is operating in, including reverse thrust. Perhaps even including bow thrusters being included in the redundant steering requirements.
Letting "flags of convenience" ships use harbors will have to be limited to those who meet maintenance and crew qualification standards, just like aviation. Too much is at stake now.