USB3 ports and cables are (when spec compliant) easily distinguishable from USB2 due to them being blue. Why was the same not done for USB-C (black for USB3, red for Thunderbolt)?
At least you (or technical support) can look up the difference. If the cables all look the same then you need to physically test the cables to know their capabilities, which is a waste of time and resources.
Colour is one of the easiest communication methods we have with 'Regular users' as they already use them as a natural key elsewhere - even things like credit/loyalty cards (Chase, Virgin) or games consoles (green vs blue vs white)
