Frankly, you're not only insulting me, you're insulting this person by suggesting that this person was somehow a special case. (i.e. that they are less smart than others, somehow disadvantaged, etc.) Whatever condition the person may have had, s/he must have been in excellent control of their mental facilities and quite intelligent if s/he was offered a systems analyst position. So I don't see the relevance of the surgery part.

Of course, this is all speculation anyways because I don't know who you're talking about or what the circumstances were, nor why the person could not "master" OS X or Windows XP. So this anecdote does not in any real way prove the 'superiority' of NDL, and I don't even see what it intends to prove, except perhaps how you feel.

If you think you can sell managers and enterprises with a moving anecdote, "it works for me" reasoning, and a focus on attacking the messenger whenever criticism is raised, well, good luck with that.