>If it is really more efficient, might it not be the better mold for gov ? Or why not wait until China is unable to subsidize, which used to be economic argument ?

It's only more efficient if we let it be. The US has the power to prohibit the entry of any goods it pleases to.
That's Trump's point.
My little guy was willing to compete fairly, but when faced with the economic power of the Chinese government he had to fold.