Yeah, you get into "factory" wiring harnesses on cars, especially those optioned out and come away with "What the heck were they thinking?"
As you know, most of the time no one guy was thinking.
Somewhere in the Fatherland, there was a department tasked with the sound system, and they were in another building from the safety-system guys, who were in a different country than the lighting guys. They did 53 conference calls to get it all together... but in the end just let each department have their own wires. Production bundled it all and told the guy down on the line to put it in the car. The first shift union guy figured out how to do it fast and right... but it was too much work, so second and third shift just did it the way the foreman told him to, so none of the wires actually ended up in the retainers.
After a couple of years of production, the accountants decided that sourcing wire with soy-based insulation would be cheaper. Marketing got a hold of this factoid, and the ad guys touted their production methods as green. It turned out that soy insulated wires is delicious to rodents, and so the food supply of the woodland creatures was secured by the tens of thousands of cars with this particular harness.
After 5 years of production, the manufacturer stopped building that particular model, and started the whole process over. Aftermarket parts kept some harnesses on the shelf (at $1927 a pop) for masochists who were not content to see a $2000 used car go to the scrap yard. There were no takers, and after 5 years of being dead inventory, the harnesses were sold to a salvage company, who stored them outdoors and provided a food source for woodland creatures.
It's the circle of life.