If you are going to have power adapters that can provide 100 watts, in the form of 20v 5a that are on the same setup as devices that might draw 5v 100ma you have to have some kind of communication.
It isn't the current draw that is the only issue, it is the voltage. New USB specs allow for higher voltages. That's a problem if the receiving device can't tell it what to set it at. The charger I have for my phone can do 5v, 9v or 12v. My phone wants 9v. Somehow, the phone has to tell it what to send.
In terms of current, that has to be communicated but not with the device, with the wire. USB-C cables that can do high current have to have chips in them to communicate that they have that capability. The reason is easy to see: Look at a standard USB2 cable. Do those wires look like they can handle 5a? Ya.
So the only way to make a standard that remains compatible with the ports and devices we already have and can provide high voltage and current is to use communication.
Otherwise, you need a clean break to a new standard that requires higher gauge cables and uses a higher voltage.