There is still plenty of hard-wired equipment out there. Way too many to color-code in many cases, but they do tend to be labeled at both terminals.
Still not nearly as elegant as the wiring found in old power substations that date back to the 1910-1940 period. The old Lake Shore plant electrical house had some absolutely awesome wiring on the back of the control and relay panels, with each individual wire pulled perfectly straight, and all turns at exactly 90 degrees, never crossing other wires. I wish I had pictures.
It also had asbestos in the insulation, but that was the standard back then.
Elegant? You wanna see elegant? You coulda been on my survey crew back in the 60’s. The forest had a one-wire system run thru the trees and poles——one wire——one.
We kept a crank phone with us and if we really needed to call home we threw a loose wire over a pole and cranked until the operator picked up. Two way talk-—didn’t even have to push-to-talk—————that’s elegant. The only down side I remember was to stay off the system during a lightening storm.