I mean, my point in saying its a literal physical form of etiquette that is systemitized is to ... differentiate it from many other cultures, where its mostly just linguistic.

Not too many other cultures have a whole system of physical manuevers that also comprise part of how respect is culturally conveyed.

Microexpressions? Nah, this is a macroexpression.

Tons of broader Japanese culture also has systemitized, physical rituals... essentially, complex dances, that either accompany or just literally are an actual ancient tradition.

There is an extreme amount of emphasis on physical control of your own body, compared to other cultures I have interacted with, have studied.

Of course, not everyone takes all of that so seriously, is so formal... culture changes over time and is never totally homogenous... Japan is also rather famous for its extremely expressive and distinctive fashion/lifestyle sub cultures.

There is differentiation, but its... its sort of like the Overton window for etiquette is in a significantly different position as for many other cultures, if that makes sense.