I think you’re making an assumption that the ongoing trade negotiations is static. It’s not. Today it’s parts, tomorrow it could be fully assembled goods.
If you’re going to negotiate, you don’t play all your cards at once.
I don’t think the end state of the negotiations is protectionist tariffs for the US, it’s to get China to drop their protectionist tariffs. If we reach that end goal, how is that a bad thing?