This implies some curious assumption that Asian countries are somehow innately better at this sort of work? I'm not sure that holds up.
Certainly the environments are different, different standards for acceptable pollution, acceptable levels of corruption, wages, safety, government subsidies, etc. These vary as wildly within Asian countries (Japan, Korea, China, ...) as they do between western countries and Asian countries though, and it's really not clear to me which countries environment is superior.
Assuming you're comparing to a high corruption low safety/environment/wages country... Lack of corruption and fraud goes a long way. Wages and safety cost less as things become more automated. I'm not sure how subsidies break down, but I suspect that there are more available for this sort of technology in the western world. Etc.
- The most advanced chip fab (TSMC) is Taiwanese (i.e. Asian).
2. Your first point doesn't really apply to my point (2), as that was more about how Tesla is actually getting feedback on their batteries in the field, through servicing their own cars / battery packs and getting constant battery data from the cars themselves and from use of their Supercharger network. This is incredibly useful, others aren't really doing it, and "being Asian" isn't really a silver bullet for this one...
3 -> how much improvement are you talking about?