And you don't think the Japanese didn't know that? (On the other hand, anyone pointing that out would have been assassinated, so...). And note we were likely

And you don't think the Japanese didn't know that? (On the other hand, anyone pointing that out would have been assassinated, so...). And note we were likely to be committed to the European theater as well. A lot of this comes down to quality, which by and large neither the Japanese had at the time, e.g. an ability to built reliable airplane engines significantly more powerful than the one the Zero started out with, and as for the PRC, the latest tidbit in this area is their embarrassment that for all the billions of ball point pens they manufacture each year, they have to import the ball bearings, since they can't produce them in the quality required, at least not at the volumes required. (On the other hand, their Long Lance torpedoes were an unpleasant surprise, and their torpedoes actually worked, or at least they quickly fixed whatever problems theirs' had (I've read in passing that all the naval power's torpedoes had problems at the beginning of the war, unfortunately the US Navy bureaucracy's total inability to believe field reports resulted in very bad results for more than a year). Then again, you didn't really need such fast and long range torpedoes, and they weren't decisive.) And quality matters a lot in warfare. Just our nuclear attack subs alone could make an invasion of Taiwan ultimately impractical, unless they somehow figure out how to find them (and even espionage isn't going to be enough to target weapons).