Looks like I'm being a dumb dumb https://superuser.com/questions/590668/understanding-power-and-data-bandwidth-when-using-usb-2-0-devices-on-a-usb-3-0-c
All the USB 2.0 devices share the 480Mbps between them. This explains the issues I've been having with having an external webcam connected, plus a USB sound card. Both are USB 2.0. If i use only one of the two devices at a time, it's fine. If I use both, it fails. :\
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