Don't let Usb4 hear you saying that, it'll be mad. USB4 is usb4. Which... very closely resembles thunderbolt. Thunderbolt 4 is PCIe tunneling over USB4. Note a

Don't let Usb4 hear you saying that, it'll be mad. USB4 is usb4. Which... very closely resembles thunderbolt. Thunderbolt 4 is PCIe tunneling over USB4. Note also Display Port now works similarly: instead of switching to an alt-mode (dedicating half the lanes to a video signal), in USB4 Display Port packets are encapsulated in usb4 packets. So now you can attach a variety of displays, to a tree of hubs, provided you have bandwidth, whereas this was a cluster fuck for a while... it's part of the reason usb-c output hubs were so rare, no one wanted to explain to consumers why a couple monitors with usb-c cables wouldn't work with their hub. Now, they will (provided there's sufficient bandwidth).