Computers could be a great asset: If in fact they are made to be back-to-back compatible.

Certain features require specially processed chips for a certain model. After a short term, the main part is discontinued for an entirely new part.

There are all kinds of complicated computations going on in each microchip. The more microchips you have, the more 1's and 0's you have, and the more of a chance of distorted data-flow to occur. Failure of one unit then leads to trigger the symptoms of failure for another, and another, and another: A chain reaction.

Frusterating repairs will be commonplace. $$$$ will be lost.

The more complex you make a car, the more a chance something like this will happen. Mechanical, or electronic. The only thing is that if all electronics are geared to the same box. Forget it, the car's junk.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)