Well, that exists, it's called Thunderbolt 3 (or 4, since PC makers decided to try to get away with a shitty half-version of TB3).
And the cable exists too, but you have to pay through the nose for it, and people expect all cables to be $5 at Monoprice.
Turns out that 40Gbps and supporting any and all monitors at the same time and 100W of power isn't an easy spec.
Everyone mocked Apple for going with Thunderbolt so early, but it turns out they had it exactly right, just like they did with FireWire, another standard that was super-fast for its time and also included robust power delivery.
And the cable exists too, but you have to pay through the nose for it, and people expect all cables to be $5 at Monoprice.
Turns out that 40Gbps and supporting any and all monitors at the same time and 100W of power isn't an easy spec.
Everyone mocked Apple for going with Thunderbolt so early, but it turns out they had it exactly right, just like they did with FireWire, another standard that was super-fast for its time and also included robust power delivery.