Re: "Which hasn't struck me as particularly advanced either"
Land based transport avoids the "Global Force for the Petrodollar" that sails the IndoPacific routes ensuring "Freedom of Navigation" for those who use the Petrodollar in trade.
Similar deal with the desirability of Arctic Sea routes, the USN does not have a massive Arctic presence.
Not totally about moving goods efficiently, more about moving them freely and independently.