Less QA testing is required if you use fewer chips. Why do I read stories that say 'modern cards may have 3000 chips'? Why? Just Why?
Why would you assume less "QA testing is required if you use fewer chips"? Do you have any idea what's involved in automotive testing? If you're qualifying a box for use in the car, why would you assume that it would take less work Qualifying it for use in the vehicle if the box has one chip in it rather than 50? The same number of production representative prototypes will have to go through the same environmental tests, for the same amount of time, with the same variations in temperature, humidity, moisture (with and without salt), changing power levels, vibration and possibly G-Levels. The automotive environment is really challenging and testing electronics to work in it is not trivial nor can it be minimized by sweeping everything up in one chip.
I guarantee you that my desktop, both screens, laptop, 2 smart TVs, and my chromebook, all sitting in this room with me, do not have 3000 chips between them.
Your "guarantee" isn't worth the bits used to store the statement. Why don't you count up how many chips are in the seven devices you've quoted? You'll find that each device has at least 500. Each one has a processor and a support chip, but there are a myriad of power management, driver (especially for LCD displays), communications, buffer and logic on the PCBs in the different devices. You probably don't think of them as "chips" but they're silicon and they're using the same technology as used in cars (although the versions used in cars are built to higher standards).
I'll stop here because you're clearly making demands towards multiple industries and disciplines you don't know anything about.