It isn’t the assembly line workers who are responsible for poor quality, it’s the designers. All the workers do is put the parts together.
The important thing is design standards. Every company that designs a new product first lays down the requirements: It shoud be X big, it should weigh X much, it should last X long, it should use the drivetrain from Y. Every requirement is a balance between “goodness” and cost.
At GM, for a long time, cost was in the ascendant; GM would do anything to a car to reduce cost, even if it meant reducing the quality of the part; as a result, GM cars got worse and worse over time, until nowadays nobody with any brains is buying them.
And those decisions get into the system, and you can’t get them out. Joe Designer designs a new clip to hold a door panel. Sure, it breaks every time you remove the door panel, but what the hell, it’s five cents cheaper per thousand. And the whole organization realizes that it’s a POS part, and when the next car design comes along the door panel engineer wants to design a better clip. He goes to his boss, and the boss says, wow, that is a better design, but whoa, it’s five cents per thousand more expensive. You’d better put together a Business Case for the change.
Yeah, that’s right, put together a study comparing the costs and benefits of putting a better door panel clip on the car. Of course, no-one can put together a business case to justify a new door panel clip. The costs are obvious (look at the invoice here) and the benefits are intangible: the door panels are not easier to install at the factory; the only real benefit is that when the customer has to tear his door apart to replace the fking door speaker that failed because it, too, was purchased for the lowest possible cost, he doesn’t swear at the fking door panel clips that break every fking time he takes the fking door panel off this f**king POS goddamned sunnuvabitchin never-gonna-buy-another-one car.
So the old part, the no-good part, goes on the new car. Until they redesign it to cut the cost a bit more.
Now, repeat over and over and over again for every component on the car, the engine control computer, the stereo, the power window mechanism, the wheel bearings, the interior trim, the little bolt that holds the battery in: Cheapen for cost reasons, kill any improvement effort because the Business Case doesn’t “close” because the benefits can’t be quantified.
And pretty soon your entire car is completely worthless.