Yea, the reason for that is America can offset any advances by Japan through exploitation of her islands. Couple that with the massive fleet Japan has to build up just to keep America from owning everything and killing her Asian units from the rear and you have a mess for Japan.
3 cats, an active 8 month old, and a wife who’d rather play D&D keeps me from doing the same thing, otherwise mine would be set up in blissful perpetuity as well…