> Hepburn has made Japanese more accessible universally given its phonetic nature and relationship to English.
It's made Japanese more accessible to English-speakers, at the cost of making it less accessible to those from other languages, and making romanised Japanese harder for Japanese people to write, and perhaps even indirectly impeding Japanese learning of English (which is notoriously terrible) as well. This is perhaps a good tradeoff for tourist-oriented materials, but I'm sad to see it becoming the standard.
> As a result, many Chinese people take on Westernized names to avoid the inevitable butchering, which is a bit of a shame.
Plenty of Japanese names are also butchered, whichever romanisation system you use. E.g. "Abe" is romanized that way in either system; "Mazda" and "Ohtani" are deliberately romanized "wrong" (again under either system) for English speakers to mangle them less. IMO taking up a name that's natural in the culture you're operating ends up better for everyone. (I very happily use a Japanese name in Japan rather than trying to get Japanese people to pronounce my birth name).