I know from the various Anker social media comments there is more USB-C coming, but I echo the need for more input USB-C.
For a complete system it is more USB-C output Powerports which then recharge USB-C input Powercore which then output USB-C. Then your devices are USB-C, your cables are USB-C both ends.
So a Powerport2 version with 2 USB-C output, would need to be an update from 24W to say 30W to give 3A per port.
A Powercore, a good size is 10000mah-15000mah with ideally dual 3A USB-C and dual or triple USB-C output (say 10000 = dual, 150000 = triple).
Given most folks are not yet 100% USB-C add a legacy USB2 Type A type on everything. e.g. my headphones are MicroUSB plus only need 1A and not for long periods.