I am wondering if those wiring would be useful in a home environment:
- Low-voltage DC wiring (isolated from mains,) for example a DC 12V system, in addition to the mains power.
- Optical fiber instead of Ethernet cables for networking.
Lots of modern electronics run on low-voltage DC power (so. Many. Wall. Warts) so why not set a LVDC power distribution system up common for the entire home? Mains to 12V DC isolated power supplies are fairly common now with higher than 95% efficiency, and switch-mode DC-DC converters stepping the voltage down to 5V (USB powered gear) are highly efficient too, reaching 98% in cases. Home area are small enough for the I2R loss to be negligible.
Fiber optics networking is interference-proof (not susceptible to any EMI) and future-proof (capable of up to 100Gbps Ethernet using the same fiber as used in older standards) while used server-grade optical fiber gear are fairly cheap. Optical fiber can run along mains in the same piping as there is no conductor in optical fibers. There are also wall panel style optical fiber to Ethernet cable bridges (most of which requires the aforementioned LVDC system or fiber-mains colocation to work)