Amd it isn't only geopolitical threats we have to worry about. The world's hard disk supply disappeared with a tsunami in Thailand. Taiwan is vulnerable to those and earthquakes. Efficiency and robustness are at odds and we are leaning too far towards efficiency. Even if China hadn't been so large it could absorb the costs of capturing the world's entire manufacturing base with subsidies, centralizing that much has risks completely apart from politics.

Thailand was flooding, not tsunamis.