If we all shy away from discussing the interesting and unique different perspectives of different cultural and social norms and objectives, we lose the opportunity to be inspired by one another.
I really dont care if someone later in the future discovers that i said i had an impression of something i saw in a society, and i dont think people need to be shielded from hearing what outsiders think of their society.
As for your suggestion that i have probably not been on the receiving end of such observations, as a non-japanese living in a country that has almost no foreigners percentage-wise, yes, i am aware of what it is like to be on the receiving end of blanket generalizations about "americans" "foreigners" "californians" and other groups, usually by people who have never travelled more than a few km by train from their home town. That kind of empty and idiotic thinking has nothing whatsoever to do with someone simply describing what they have seen with their own personal experience in a foreign land.