Do you think there is a reason Garleans can't use magic?

[Jandor]

The Garleans lack of magical ability isn't generally that big a deal, the average Eorzean can't really use magic in any meaningful capacity either.

Sure, theoretically Eorzeans can learn how to do it, but most don't really seem to bother. Even if they do try and learn, it's no guarantee that they'll actually be any good at it.

We run in very magically proficient circles and therefore the Garlean lack of magic looks like a ridiculously over the top handicap, but compare the average Eorzean to the average Garlean and frankly, the Garleans seem to win out.