you guys seem to forget that japan did not really need tanks. Japan mostly fought in a jungle enviroment where it is very hard to use tanks because of no roads/ jungle everywhere/and close quarters combat due to trees being everywhere.
When you are that close even a shitty 47 mm gun can do the trick. And no amount armor is going to save you.
Japan had superior planes than USA, and a pretty good navy, and those are the important things when you are fighting in the pacific.
Just because they have shitty tanks, Panzer can be stopped by forest? said the French