They can be, but in practice you’ll want a cable capable of at least 60 W for the laptop. So now you either have to carry all the same high power cable (more ex

They can be, but in practice you’ll want a cable capable of at least 60 W for the laptop. So now you either have to carry all the same high power cable (more expensive and wasteful) or give up on the benefit of having one type of cable to begin with.