We no longer need ANY CABLE for data.
What universe are you living in? I run a company that manufactures wire harnesses. If we didn't need data cables I wouldn't have a job anymore. If you are one of these deluded people who thinks we can do everything through wireless then you couldn't be more wrong. The need for data cables will be around long after you and I are gone. What we don't need is unnecessary, redundant, uni-tasking cables. Single function power cords cannot die soon enough for mobile devices.
It's only where POWER and DATA go over the same cable that we end up with horrible proprietary crap!
Come again? USB isn't "horrible proprietary crap" and it has power and data. Basically none of the cables we are talking about are proprietary EXCEPT for stupid vendor supplied power connectors. Perhaps you aren't old enough to remember every frickin' cell phone vendor shipping their own unique power cable. Now you basically have either micro-USB or if you are using Apple, lighting. Prior to USB-C so did every laptop vendor. HUGELY wasteful with no commensurate performance benefit.
Laptops have had that forever... Their simple barrel connectors can pull 200W+, no trouble at all.
Who gives a shit? What mobile device are you using that needs to pull 200W? My desktop computer doesn't even use that much power. Single function cables are idiotic, wasteful and unnecessary in the vast majority of cases. Particularly ones that only one vendor uses. The barrel connectors used on many laptops are particularly annoying. Having to carry a special quasi-unique power cord around everywhere is idiotic design.
And no USB connector will ever be 1/100th as durable as a tough, simple, basic barrel connector.
Demonstrably not true and completely missing the point. Barrel connectors have their uses but powering a laptop, tablet, cellphone or other mobile device should not be one of them. It is wasteful, unnecessary, and provides no meaningful performance benefit. The ONLY time a unitasking cable should be used with a mobile device is if there is a undeniable performance benefit, it will never be unplugged, and there is no multi-function substitute available.