@freemo Which are the reasons that we've learned the hard way that would still apply to ships? I thought we learned the hard way that building them near a shore is bad due to flooding risks, but that doesn't apply to ships that can move away from the shore.
In the responses you mention that containing leaks is easier on land, and that ships are less secure (are they less secure than land vehicles?). I don't think these are lessons that we learnt the hard way, so were you referring to something else too?