I am going to tackle this, from a coders point of view, you can very quickly see if someone is any good. Or a designer, sysad, most other things.

But MBA are like economists, they all have different ideas on how to advance, and it is very hard to actually hard to test them, takes a long time to see if they were actually correct, if they fail they have a good reason, and it all sounds like something you could have worked out anyway.