The problem is that a cable saying that it's something does not mean that it actually conforms to the standard and can deliver that speed/power. And proper testing requires complex hardware.
That's true of every cable that has ever existed, including basic electrical wiring, and so feels like a separate problem than merely identifying what kind of cable a cable even intends/claims to be in a world where they all have the same shape connector: don't let the perfect be the enemy of the good.