>Taiwan today is culturally much more similar to the PRC than it is to the West

The cultural distance between Taiwan and Japan, Korea and Hong Kong is less than the distance from mainland China. Aka Asian liberal democracies (or at least with strong political plurality and civil society). You're mistaking a regional difference with a commonality with the PRC, when in reality the PRC's epistemic worldview is highly distorted in comparison to virtually every other actor in the region. They don't speak for the region.