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Now that every PC ~and their dog~ has had USB-C/USB3 ports for a while It is strange that we can't use it for direct connection easily and still have to bounce link off some noisy channel first.
Like, come on, the devices are sitting next to each other. With a single symmetric cable we could be having secure 5Gb+ connections right away! 
@cab404 Yeah, but without the Intel in the middle.
@dpwiz for that we kind-of sort-of have usb4 interdomain https://learn.microsoft.com/en-us/windows-hardware/design/component-guidelines/usb4-interdomain-connections
@dpwiz That would be great, but what about the software to make that works? Should the systems appear as mass-storage or network drive?
I remember using null modem and making ethernet crossover cable, that was very convenient indeed :)