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I am sorry that you have been subject to the typical downvote-squad that's downvoting everything they don't agree with, even if your post was perfectly fine. I upvoted it.

> Can someone explain to me why it's a bad thing?

I am just a layman, but how I see it is simple. If you move everything in a branch of business to another country, you will loose the possibility to do that branch in case of some bad event would strike. That event can be because of politics, but it can also be because of nature.

If you move all production to China for example and they have basically a monopoly on producing a certain good, let's say batteries as an example. Then I think it's pretty much inevitably that they're going to use that against you as long as the nation states exist. The prices will start to go up artificially and by then you may start looking for options, but then they may already own all big mines in the world and have taken claim on the basic materials you need.

What do you do then? The only answer is to suck up to whatever their demands are.