The problem is that "good" cables are also really expensive. And thick.
Sometimes I just want to charge my matchbox sized flashlight from Aliexpress. I really don't want to use the full-on 120W + network + 8k video capable cable for that. It's so thick that the weight of the flashlight can't hold it down =)
Maybe they'll figure out some kind of markings for the cables eventually.
I'd mostly use three categories: Charge Tiny Device (5-10W enough), Charge Medium Device + data (20-30W, phones and tablets), Charge Big Device (laptops, power banks - as much as the spec can handle)