> That's what I was thinking of, yes. Mechanical components tend to fail 
> much
> more easily or regularly than a few tens of millions of transistors, not
> true?

Just depends on how it's been designed really, both electrical and 
mechanical systems can be rubbish or really reliable.  I suspect as a very 
rough rule-of-thumb, the mechanical parts are more vulnerable to extreme 
shocks and vibrations, whilst electrical systems would be more vulnerable to 
static and extreme temperature/humidity.

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