Power and data can and should go over the same cables.
We no longer need ANY CABLE for data. Your saddling yourself with restrictions to satisfy a long-lost need. And...
Proprietary charging cables are wasteful, annoying, redundant, and unnecessary
It's only where POWER and DATA go over the same cable that we end up with horrible proprietary crap! If phones had power-only cables, they'd have been simple, standard barrel connectors.
Now USB just needs to settle on a single un-keyed connector that can carry enough power to run a laptop
Laptops have had that forever... Their simple barrel connectors can pull 200W+, no trouble at all. And no USB connector will ever be 1/100th as durable as a tough, simple, basic barrel connector.
There's only ONE THING I give USB credit for... It sucked the air out of all the subtle variation of voltages around its range. Instead of devices that needed 3V, some that needed 6V, and others that needed 4.5V, and even with some that wanted 7.5V, now all those devices will have mini-USB plugs (usually not micro-usb), and run on 5V.
Of course if every smartphone charger on the planet switched to 12V, it would have the same effect on laptops, and all other devices that use any voltages anywhere around that range.