I’d love to hear though if there’s any gateways that Comcast rents that provide 2.1 amps.
I don't know the reason, but Comast seems to have no interest in the USB port. It seems like it would be a useful addition to users to have a usable data port/ power port on those devices. Seems like a 3.0 USB post isn't asking for too much. ¯\_(ツ)_/¯