

The way it works for power over Ethernet — and I assume USB power delivery must work the same way — is that it does not reduce bandwidth because they run the power and the signal over the same wires at the same time.
There is a a power injector at one end and a filter at the other end that separate out the high-frequency signal and the DC (no-frequency) power into different wires.
This is essentially the same thing as they’re already doing for multi-frequency stacking on those same wires (and on fiber) to get the crazy bandwidth in the first place. DC power is just one more low (very very low) frequency running on the same stack.
How does the construction app know what needs to be constructed and how?
How does the waiter app know which table ordered what, needs attention, etc?
How does the IT app know on which port every device is connected?
These things are all real hard to know. Having glasses that display the knowledge could be really nice but for all these magic future apps, having a display is only part of the need.