I know we have the technology available, without even needing to invent new protocols, to send video from our laptops, tablets, and phones, to nearby TV sets and displays.

This is depicted in a lot of science fiction: A simple gesture allows someone to swipe or fling the display from their handheld device to a nearby wall display or holographic display. You see them do it a lot on The Expanse, for example.

Existing firmware and software on the devices could do this with a few minor tweaks. But for now, we have a needlessly complex system of conflicting proprietary protocols, mostly exemplified by Google Chromecast and Apple TV which are not interoperable. In the past, we had Intel WiDi/Miracast which was very poor and didn't manage to go anywhere. The process of using a secondary display for your device is currently a barely-functional mess.

It could be so much better, if the folks at Google and Apple would stop playing walled-garden and just let it work as it should.