THAT's exactly what I was trying to say. A general does not have to have experience working EVERY low-end clerical or technical job in the industry to be proficient in division-level logistics. But he certainly DOES have to know *his* part of the job!
The only thing a novice can learn from books regarding logistics is how past armies did it using their system. And that its important. Hence why professionals deal with logistics, because they can only learn by doing their jobs full time over a career. Amateurs have no way of learning how a bureaucratic logistics system works as they aren't in it, so they can't know how it works besides knowing its important.