I have tons of Chinese rims. They are much easier to see quality deficiencies up front. You can see if they are out of tolerance before even using them.Sometimes that's true. I've found more often than not, though, if you're willing to put in the time to do your own research, you can get a lot more than what you pay for. The big name tire companies put a lot of time and resources into making a large variety of constantly evolving tires. You pay for quality, innovation, and marketing. Some companies make quality products, but don't put a ton of money into marketing or r&d to make minor improvements on an already good product. If we want to save a few bucks, it's up to us to figure out where the "cheap" tires had their cost cut. Not all of them had it cut from quality.
You can even check materials after they are made (I have access to that equipment, and have). Not so much with tires, as it's just about as much of how
they are constructed, as what materials were used. Are you claiming you have somehow checked new tire quality? Obviously, there is no guarantee even
if you buy top of the line Mich, but I've had Chinese tires fail catastrophically. I've had Chinse rims out of round (often, even when new), but never outright fail.
I've had a "bit" of experience doing 100's of engineering investigations for 35 years for the Navy. It's a lot harder to investigate something like a tire
(they way it is constructed), vs something like a rim.......... So to each there own, but that's why I won't buy cheap tires, especially from China.