[danbulant]

It'a weird that this isn't normal. I bought an "AlzaPower" cable, which is just a rebrand of some chinese manufacturer by a local reseller ("czech amazon"), and they have their wattage as well as speed on them (100W/5Gbps). Then also a samsung usb c cable, which was pure white, has nothing on it and doesn't seem to support any fast charging or higher speeds..

[usrusr]

5Gbps is conveniently unambiguous, but 10 and 20 exist in variations that use four lanes and in variations that use two lanes. According to Wikipedia, the symbols with a number are only specified for the four lanes version, but there's little doubt that half-width cables will also be be advertised with whatever bandwidth latest devices could funnel through.