And also, looking into it, it seems that it is indeed possible to send data and PD higher than 3A at the same time, as this device states:
This seems to be in line with what the standard says:
So, at a minimum, USB4 hubs should be able to provide 3A with data per port by using USB Type-C Current, and possibly more if the device is able to do data and USB PD at the same time, as this linked device seems to be able to.
It makes sense, because when people connect their MacBook to a USB-C display, it quick-charges the MacBook through the same USB port through which the high-bandwidth video signal is transmitted. I believe they achieve the high wattages by also increasing the voltage, but nevertheless I'm sure that they charge at more than 3A.Quote from: https://www.coolgear.com/product/usb-power-delivery-4-port-type-c-240w-super-speed-hub#1
It’s bi-directional with power transfer while transmitting data.
This seems to be in line with what the standard says:
So, at a minimum, USB4 hubs should be able to provide 3A with data per port by using USB Type-C Current, and possibly more if the device is able to do data and USB PD at the same time, as this linked device seems to be able to.