What's your point in derailing and making wrong statements? Cream cheese goes well inside (not on top) of sushi, which is backed by it's popularity outside of Japan. Which was a reply to GP saying cheese doesn't "go" with Japanese cuisine. None of your replies make any counter argument relevant to that, because it has nothing to do with current usage, but with future possibilities.
It might not be the first choice of most Japanese, if they kew about it, but neither is pizza. Pizza is, like cheese in supermarkets, an overpriced exotic or tourist meal. Sandwiches are a notable exception of affordable western style food here.
> Cream cheese isn't popular in Europe either.
It actually originated in England and it's extremely popular in Germany. You can find multiple types even in Aldi (the cheapest supermarket with smallest selection in Germany).
I'm honestly curious on what experience you are basing your conclusions. It seems to me it's based on short trip tourism.
- Japanese people aren't ignorant. They don't want cream cheese on their sushi, or gobs of mayonnaise or whatever else you are accustomed to. The california rolls you enjoy are not the same as Japanese cuisine eaten by Japanese people living in Japan.
- Aldi supermarkets aren't really representative of Western European tastes. You can find American food anywhere in Europe if you look for it.
Fun fact: Today I bought a self-cut sushi roll assortment in the bento area of my local supermarket in Kansai and one of them was with cream cheese in it. They have some special this week.
Cream cheese isn't popular in Europe either.