Grab a USB-C to USB-C cable that came with a phone or similar device and was intended for use with a USB-PD charger and give it a test. You might get USB 2.0 speeds if you’re lucky, but you’re unlikely to see anything beyond that.
Even more fun, many of them don't properly list what power they can handle and fry your device or catch fire if you put to much through them!
That doesn't make sense. Any cable will be capable of many more volts than USB will ever put through it. How is anything going to get fried?
I suppose a cable could get too warm, but lying about capacity only takes you from 3 to 5 amps. That little bit extra should never be enough to cause a fire. And if it can't even handle 3, then the problem was not that it was lying about capacity. It also costs extra money to lie about being a 5 amp cable since that requires a chip.
I mentioned volts for frying, and I mentioned amps for fire.
And I don't think either failure can be caused by a cable failing to properly list what it can handle. Do you?
The Nintendo Switch can get fried in dock mode (and Nintendo usually has pretty top notch QA/abuse testing outside of joysticks)
Here's a report of an A to C cable on fire from Anker (another pretty well regarded manufacturer) https://www.reddit.com/r/Android/comments/7j3k38/anker_usbc_...
That cable is more of a complexity problem, but it wasn't because it misrepresented capabilities or anything. They put in a chip which didn't reset the connection when you unplugged one end. I don't know if that's really a spec problem, though.