The user may be talking about DisplayLink USB displays (they install a secondary driver and create a virtual video buffer to draw in before sending it across USB to a device that draws it on screen)... not USB-C DisplayPort.

DisplayLink is pretty awful. Especially on macOS, due to limitations of macOS, they are laggy, don't display certain apps correctly and more.

There are quite a few docks out there (I know Asus had one) that use DisplayLink technology to show external displays.