Well take this with a grain of salt (it comes mostly from informal discussion with Taiwanese), but my understanding is that whereas there was originally a sort of ethnic/historical split to Taiwanese identity following the RoC flight to Taiwan, recent generations of Taiwanese are increasingly self-identifying as "Taiwanese" (as distinct from "Chinese") regardless of which side they come from ethnically, though the ethnic split is still something people are aware of.
I.e., many people now seem to have separate "ethnic", "cultural", and "national" identities (which can make conversations rather confusing).
I.e., many people now seem to have separate "ethnic", "cultural", and "national" identities (which can make conversations rather confusing).