Or at least, it’s not obvious what electronic devices you actually would need if the supply was going to get cut off for ten years.

Right, that's what I was thinking.

This would mean catastrophic economic damage. Likely, would be far worse than the great depression. We important so many goods from China.

Why would China and the US get into a hot war anyway?

They aren’t. China needs the US more than the inverse

It's unclear whether the US would deploy its own military to protect Taiwan in case of a Chinese invasion... but it could happen.