If the USB forum enforced their specifications, everyone would be complaining that their cables are now ten times the price, and people would still buy knock-off cables.
Same goes with chargers: I bought a 100W charger that stops delivering 100W after it overheats about half an hour into a session. I could spend twice as much on a charger that sustains the charge, but I probably wouldn't have bought that charger at all for that price.
USB-C would either be branded a bullshit expensive standard (like Apple's Thunderbolt cables are generally regarded) or an incomplete standard that gives manufacturers too much leeway.
I, for one, am quite happy that I can just buy a USB C charger now rather than spend 180 euros on an OEM replacement, even if I ocassionally need to throw a cable into the "garbage that came with an accessoire" bin.
What? The USB mafia has been at it since usb 1.1 or at best 2.0...