Always interesting to see the analogs of island vs continental culture when comparing UK America and Japan China. Seems like islanders, due to their reliance on trade, naturally get specialized and autistic about their craft so they can have a comparative advantage, and their obsessions carry over into stuffy traditional practices.
when America was settled/founded by Britains, etiquette had not been standardized in GB either so the differences are due to parallel development, not island vs continent. That probably holds even more for differences between Japan and China.