My central argument was supposed to be that when you've spent the time to develop the skills necessary to use Linux as a platform to the point where the advantages of the OS X platform are invisible and the deficiencies are glaringly apparent, you're not going to prefer OS X, despite the fact that it's still perfectly fine for a whole ton of people.
You summed it up pretty well, but I would put it slightly differently: there is a point where the characteristics of OSX are no longer an advantage, but a hindrance, the same way as the characteristics of a more traditional Unix (or Linux) are a problem for those who are more used to OSX or Windows.
There is a time you have to get rid of the training wheels.
My central argument was supposed to be that when you've spent the time to develop the skills necessary to use Linux as a platform to the point where the advantages of the OS X platform are invisible and the deficiencies are glaringly apparent, you're not going to prefer OS X, despite the fact that it's still perfectly fine for a whole ton of people.