Bob Lutz hat völlig recht. Es genügt im Prinzip SWs zitierten "Quote 2" zu lesen:
"Saab continued to operate largely autonomously, with all functions, including design, engineering, and purchasing, soldiering on as though they were still independent. The last Saab 9-3 was supposed to share most major systems with the well-engineered (but stylistically challenged) Opel Vectra. But, in a spirit of “we know better,” almost everything was changed, including the entire wiring and electrical system, as well as the engineering-intensive heating and air-conditioning unit. Since Saab sourced these and others to new suppliers, the economies of scale were lost, and the car became needlessly expensive. The fact that the specific Saab electrical system turned out to be heavily failure-prone didn’t help. This type of “brand character” can only be called wasteful stupidity. "
Genau das hat die Saab Verluste verursacht, obwohl GM immer wieder auf die lebensnotwendigen Einsparungen durch „common parts“ hinwies. Kein Wunder, wenn sie irgendwann genug hatten und sich von dem Dauerverlust Partner trennten.