I suspect that they are willing to wait a few more years until they have built up their own chip making capacity so that disrupting Formosa won’t strongly affect their own economy, while it will hinder other developed countries.

I'm not so sure about that. Taiwan pro-reunification party still grows, and its economy is hyper-specialized (not surprising, neocolonialism etc). If china's chip production capacity reach acceptable level (which it will), enough to put downward pressure on lesser chip, Taiwan economy might suffer enough that they vote for a reunification, probably as an autonomous regions (like Guangxi or Ningxia). That would be China's ultimate win.