To make Taiwan less critical makes it less attractive as a target - China won't be able to damage the US so much by taking Taiwan. It will be harder for China to force other people to accept their action.
Not less critical but you see if they steal something the rest of the world needs then they can hold the world to ransom but if the rest of the world has alternatives then they can't. That has to change their calculations about when and how they will make a move.
Why do you think Taiwan reuniting with China would steal anything from the rest of the world? Nothing in Taiwan is owned by the rest of the world, Taiwan itself owns what they have. And the Chinese government will not stop selling what Taiwan produces.
Oh, I see, you're trying to excuse the Chinese for being arseholes now because someone else did something in the past. It's irrelevant because it's not in the interests of the rest of the world for Taiwan to be gobbled up.
