The thing is, why is portability so important in a MH game? You can make any game portable by downscaling features.
MH, is a hack and slash IIRC, and won't be significantly enhanced by being portable, other than the fact that "you can play it on the train with your friends". In fact, those advantages apply to ANY handheld game with multiplayer. Multiplayer can be handled locally as well if you invite your friend to your house.
The only valid reason I can see is that the Japanese like portables, but it won't necessarily imply that a portable release of a game sells way better than a console release, since it's mainly the brand that make it sell.
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