So I assume every time you need a leak plugged you ship your whole house to Guangzhou ?
replyNo, I search a few YouTube videos, and buy less than $100 of tools and supplies that were made in China from Home Depot, and fix the issue. Or a plumber uses tools and supplies made in China to fix the issue.
reply“Advanced trades” would be making and fixing the machines used to make the tools and supplies to fix the leak.