Trump involuntarily did more for Taiwan / mainland unification in one meeting with Zelensky than in all the years prior. Taiwanese now understand that they can't trust US to step up to their security commitments. If US won't do it for Europeans being savagely attacked by aggressive neighbors, they won't do it for Taiwanese being blockaded by mainland. At that point Taiwan tariffs and China tariffs will be the same. That was brandished as a powerful weapon about Hong Kong and didn't really do much.