Also when you visit most japanese websites you can see this phenomenon.

I've read an explanation once that this is because culturally, japanese people perceive a wealth of information and choice as being re-assuring and trustworthy, while most westerners feel more re-assured by seeing less content and choice presented in a more minimalist kind of way.

I actually prefer content style of Japanese websites. I get all the relevant info on one screen instead of having to scroll/click thru tens. The western style websites are very inefficient and hide info (feels scammy with lack of info).

Can you point to some japanese websites that have an english version and are a good example of this?

oh I hate minimalistic UIs, I think I might have just found my people