I'd guess that this might be related to USB A (2.0) being only rated for 2.5 W (up to 7.5 W for the "Battery Charging" specification), while USB C needs to supp

I'd guess that this might be related to USB A (2.0) being only rated for 2.5 W (up to 7.5 W for the "Battery Charging" specification), while USB C needs to support at least 15 W (up to 240 W) ?