Seems negligent to not include extension cables in the spec. Lots of hubs have too short of cables, or one needs to expose a plug somewhere other than where the PC is.
This risk is a bit exaggerated. If you're charging a phone or even a non gaming laptop, most extensions are still fine. Of you try to push 240W over a cheap Amazon basics cable... Yeah no.
Those are 90% of the ones available, 95% of the small factor ones and 99% of the affordable ones. One of the main reasons for them to be non detachable is because most users would pick any random USB cable and complain it doesn't push 4K while charging the laptop.
Source: I've made the percentages up, but it's very close to that range.
Actually if somebody knows one that's good, small, affordable and detachable I'll be happy to know.