I guess it all depends on how you define the word "China" or "Chinese".
If I said "Taiwan is part of Asia" or "Taiwan is in Asia" would everyone freak out?
The stigma about "China" comes from 1. Feudalism. 2. Communism (including the CCP and the stuff they did)
If we come up with a completely new, brand new defintion of "China", then what?
I would never advocate Taiwan being under a feudal dictatorship. Historically "China" has been defined by dynasties. Whoever happens to be in charge, happens to be the definition of "China"...
How do you define it?
As far as the world is concerned, China means People's Republic of China.
Taiwan is not part of that.
China is a political term, not geographic.