One of my obsessions is that if the decision making processes become too centralized then the whole system is already struggling inside some very dire straits.
Here is a rather unusual example.

Tampering with a car’s brakes and speed by hacking its computers: A new how-to

Now why on Earth would the remotely accessible (hack-able) devices of a car be hooked up to some essential components like the braking system or the steering column?
Simple. This way it is easier/cheaper to program/debug/service the entire system. The operator needs to ‘enter’ only once – otherwise he  would have to hook up at least two times, one for the essential systems and a second for the rest.
And since the automakers are in the business of making money, not safe cars – just like the farmers – every $ counts….