Many of you really need to get past the whole " Orange Man Bad " thing as it tends to cloud your reasoning skills.
( Of course, there are those in this Country who want exactly that. Keeping you fearful and angry makes you easier to manipulate. )
Try, for just a moment, to ignore politics if you can.
There is no instance where relying upon a single supplier is a good idea in any industry. Not one.
Doing so may be cheaper in the short term, but you will pay for it dearly in the long run.
Some simple examples:
Networking stuff
My own company utilized a well known vendors hardware for the vast majority of its routing / switching setups. Deep discounts
early on to outfit the networks with their gear. ( massive network sizes btw. My network alone was 30k+ routers / switches )
Once they have you reliant upon their gear, that's when you're no longer in control of your network because it becomes
prohibitively expensive to swap it all out and the vendor knows it. They will raise the prices at will including those of parts and
support and you will pay it because, in the short term, it's cheaper than swapping to another vendor.
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Federal Funding for States and Institutions
US States and institutions who rely too heavily on Federal Funding to make ends meet give the Federal Government too much control over
them because, if they don't toe the line, they'll simply use the threat of stopping all Funding as a means of control.
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Investments
You don't keep your entire portfolio in a single stock do you ? Why not ?
It's called risk management. If something happens to your one stock and it craters, you lose everything.
Hence, the reason we diversify to manage said risk.
Or as the old saying goes: " Don't put all your eggs in one basket. "
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Examples like this can go on and on but you get the idea.
The World really needs to diversify where their goods and raw materials come from. Because if we don't then China
has the ability to pressure everyone into doing what it wants because it is currently the ONLY source for many of the things
the World relies on everyday.
China would like to keep the World very much dependent on them because it gives them an awful lot of hidden / indirect control
over every other Nation on this planet.
If you're good with the fact that China is in control of your economy then, by all means, continue to carry on business as usual.
Otherwise, you should begin to take the necessary steps to lessen the reliance on China as the sole supplier for so many things.
Your future economy will thank you.