Those very fast consumer interconnects are distinguished from ethernet by very limited cable lengths though, none of them are going to push 10gbps over tens of meters nevermind a hundred. DisplayPort is up to 80gbps now but in that mode it can barely even cross 1.5m of heavily shielded copper before the signal dies.
In a perfect world we would start using fiber in consumer products that need to move that much bandwidth, but I think the standards bodies don't trust consumers with bend radiuses and dust management so instead we keep inventing new ways to torture copper wires.
> In a perfect world we would start using fiber in consumer products that need to move that much bandwidth
We are already doing this. USB-C is explicitly designed to allow for cables with active electronics, including conversion to & from fiber. You could just buy an optical USB-C cable off Amazon, if you wanted to.
When you make the cable do the conversion, you go from two expensive transceivers to six expensive transceivers. And if the cable breaks you need to throw out four of them. It's a poor replacement for direct fiber use.
Sure you need fiber for long runs at ultra bandwidth, but short runs are common and fiber is not a good reason for DAC to be expensive. Not within an order of magnitude of where it is.
In a perfect world we would start using fiber in consumer products that need to move that much bandwidth, but I think the standards bodies don't trust consumers with bend radiuses and dust management so instead we keep inventing new ways to torture copper wires.