The other thing to consider is market placement, Honda in Aus is primarily seen as a premium brand, Honda in the US is more mainstream, and cross shopped with the Toyota Camry.
Acura covers the premium market stateside.
Also consider the sheer volumes in which Hondas US factory pumps out just for their market, Aus bound cars by comparison are small fry when they have to engineer specific features to cover our ADRs.
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