that's the problem! in the real world (remember - "lowest cost bidding" is the iron law of business, random manufacturers out there who basically have profit margins of a penny per cable etc.) you can't be sure of the quality and provenance of cables that you encounter - of $x used in the manufacture of the cable, the vast majority of it will be spent on making the cable look good, not whether the internal circuitry is good.
I've had situations where people hand me a Type C cable and the emotion I feel is fear. I don't know how good or bad that cable is and I don't know if I should plug it into my machine. What do I do? are we now supposed to travel everywhere with our own cables?