Thinking a bit more about this, if they made a 60W USB-PD charger with 2 ports, then if you used 1 of the 2 ports it gets all the 60W but if you used both then they each got 30W. Indeed, if they could basically fight over the 60W total budget then two empty devices would end up with 30W each as then as one of then begins to get full and reduces its draw, the balance could go up for the other device.
Then a 4 port 60W version.
These could then be the USB-C equivalents of the Powerport2 and Powerport4.
Probably the 4 port needs one or two of the 4 ports non-USB-C for the Anker earbuds we seem to be sold which are MicroUSB still