Personally I find many of the girls mentioned VERY hot but Im not naive enough to think that all porn viewers are as egalitarian of ethnicity.
Many US/Euro porn viewers are just not turned on by the ASIAN look.

Maria Ozawa to all intents and purposes is caucasian, just with enough exotica to her stew to make her irresistible. IMO

On a different point .
I remember one BTS interview with Fujiko Kano where she said that Jap porn was yucky and weird and US porn paid better.
Do you think its the language barrier stopping more Jap exports or something else?
It cant be the misogynistic attitude in the US, after all they invented Bukkake, Gokkun , water bondage fuck machines etc.