@EUCommission
Excspt USB-C is not the same as USB-C. You can have a power supply and a device that supports the same number of watts, but the charger does so by supplying more volts where as the device demands more amp.

Then there's the cable which may not support either.

And that's just for charging, sometimes USB-C is not USB at all, but HDMI or Thunderbolt.

Specifying USB-C is worth about as much as specifying that it must use a copper cable. My wall socket can deliver 2300 watt (230V, 10A) and my car battery can deliver 2400 watt (12V, 200A), both over copper cables. They are still not compatible.