I once worked in a company that built huge control panels for industrial machinery, water treatment plants and theme parks. We labeled both ends of each and every wire (
and some panels had over a thousand wires), neatly bundled each run and zip tied the bundles every 8" and secured them in raceways. Wires were all color coded by gauge of the wire. We actually found that assembly and maintenance was quicker and easier when everything was neatly arranged.
All of which explains why I damn near threw up when I saw the
"explosion in a spaghetti factory" wiring under the bed in our rig.