Oh interesting, I didn't think monitors could run video over the USB cable and still offer a USB hub on the same connection, but it looks like the DisplayPort data goes over the additional USB-3 lines and preserves the original USB-2 connection for accessories. Good to know.

Thunderbolt displays can do hubs at full speed, the 5K LG Ultrafine has 3x USB 3.1 gen 1, which IIRC means up to 5 Gbps (vs 480 Mbps for USB 2).

Not sure why your comment was marked [dead] but I just vouched it so it should be back.