How did the quality control passed it? The lag on some of these car infotainment system just to change the sound is abysmal, someone definely saw that and should have said something, you paying $30,000+ for something that takes 4 seconds to respond to a music volume change. Whoever is responsible for that should not work there...
The quality control came last in the process, so when they 'finished' not long before the delivery date is due, QA gets a ton of political pressure to not make the date slip.
That's why test-driven design is valuable -- you iterate while testing.
