Getting back to my original theme. Japan, Europe, the World, has benefited by open sea lanes for sixty years, complements of the US Taxpayer and the officers and sailors of the US Navy.
In the case of Japan, if they don't like it, then the Japanese taxpayer can pick up the tab, say another $100 billion US per year, and 50 or so sailor deaths, for making sure Japan gets its oil and can deliver it's goods through the rougher neighborhoods of the world.
I doubt that will happen anytime soon. Too expensive and too political, so it's left up to the ugly Americans to pay and do.
So, from an effectiveness standpoint, what's wrong with the Japanese Navy.