I think this is important to stress, because "doing the Japanese thing" isn't a natural, subconscious thing. It's a deliberate "playing the part".

The uniformity of Japanese society isn't entirely due to the uniformity of its people. It's also strongly driven by people responsibly acting like they are "supposed to" in role play fashion.

There are many people who couldn't handle the role play and bowed out of mainstream work and life. It's kind of like not being able to guzzle down the coolaid at a "SV Startup" and thus bowing out.

So sometimes I ask the question, like it's great in Japan, why do you want to be here? The reasons are various, among them things like, "I like just addressing people by their first name", or "there are people from many different countries and cultures in Canada; people are not 'the same'".

Once on the train (in Canada) I overheard some snippet of conversation among some girls about some planned event, "... minna Nihonjin dakara ikitakunai" ("I don't want to go, because everyone there will be Japanese").

Arguably, for anyone, it always is just playing a part. Japanese seem to get this point better than some, so tend to keep in character for longer.

So then whether it's acting its just a question of how deeply is the learning integrated into your personality and how it aligns with your so called temperament.