Saying that there are exceptions to a general rule only implies that the general rule really is true most of the time.

A software developer often has to manage customer expectations....

I'm sure Andy misapplied the triangle analogy.

The triangle analogy could have been applied to how long it took to get to 2014 and the kind of computers available these days..

I...

I'm pretty sure the triangle analogy relates to software development projects and not mass produced hardware.

There's a good reason for that analogy and I think you missed the whole point...