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Are you suggesting there is no provider of high quality nails at industrial scale?Nails was one of the examples cited by the gp, which I found funny since there is one famous example of nails being lower quality by definition as a result of centralisation. That example isn't the case for all nails (nor for all the gps examples), but it is still an excellent, if isolated, example: cut nails. Most carpentry nails you buy today are wire nails. I don't know if it's possible to buy cut nails today from any large factories, but broadly speaking, manufacture of cut nails does not scale. The switch to wire was a detail of the manufacturing processes, not of consumer demand (nor quality assurance). Cut nails are still considered superior today.
If you look at antique diagrams of nails available for purchase, you'll see 20 or 30 varieties, all with very distinctly different designs. Those designs have converged on a single design for all applications, not because it's a better design, but purely because it's a design that scales for manufacture. Flaws in the design are compensated for via material choice & worker skill.
There's likely thousands of such cases in industry.