ORIGINAL: treespider
[...]in the game the Japanese have a huge surplus of shipping available for all of these fantasy invasion scenarios[...]
The US used about a hundred ships (under Russian flag) to ship lend-lease goods to Russia via Vladivostok (about half of lend-lease for Russia went via the Pacific Route!). Does not happen in WitP, so Allies gain a lot of shipping in the game...
EDIT: Ok, skimmed through the rest of the thread. My 2 cents: I'm a player of 'the second type' who does not want a balanced but a historical game. Playing Japan, I accept from the beginning that winning the war as Japan should be impossible. The challenge would be to do better than history by holding out longer and/or inflicting heavier losses. So I want a game that gives historical units, capabilities and restrictions.
So IMO, a true "Sir Robin" should be impossible due to political reasons (some of them noble, some of them foolish). Abandoning the PIs or not defending Singapore simply wasn't an option. Even HongKong, although obviously doomed before war started, received reinforcements because prestige and honor demanded not to lose it without a fight. So the game should imposse heavy pp penalties to make a true Sir Robin of the PI and DEI next to impossible, and
the CW units in Malaya should be under a restricted command as well! OTOH, regrouping troops e.g. a concentration of PI units to defend only Manila or withdrawal of all units in Malaya to Singapore should be possible - even if it may be bad strategy.
In this context - I am infuriated that the game does not allow air transport of 'restricted' units within the area of resticted commands. My plans for southern China went awy when I discovered that I cannot airlift CEA units from Shanghai to Canton...