Why would it be non-standard? USB-PD is almost completely decoupled from the rest of USB, and USB-C connector doesn't imply 'super speed' lanes are available. The only thing it really changes from an implementation perspective is that you don't have to route high speed lanes to the port, and don't need them to be available on your USB controller.

Doesn't seem to be very Apple-like to have two identical looking ports with different function, though.