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These ships are designed for specific ports/routes.
The cranes at the docks as well as rail lines or truck lanes also have to be redesigned. Look for robotics and automation.
The ships do not stand alone in the big picture.

Sometimes ships do get too big or too fast for practicality.
The 33 knot SL 7’s were found to not be the right niche and were eventually turned over to the US Navy. Tankers got too big and came back down in size for practical reasons.

These ships have a practical lifetime of 25 years. Earlier demise if it doesn't work out.