As someone who’s been working in manufacturing for over the last decade. I can say the quality of fittings and products I get doesn’t matter where they come from, I make hydraulic tubes for big equipment. China USA, Canada it’s all pretty much junk with no QC.
Well where a work, one of the products we sell is chromatography tubing. Any material from China can't meet the required surface finish. Tubing from the USA is about a 5% rejection rate. General it's more about quality control from China sucks.