A better question is why would you need to macro your spells? BLM is just about the most bare bones basic DPS when it comes to rotations, and it all fits and flows together pretty neatly.

Now, if you're having trouble with, like, hand mobility, or you have poor reaction time, or something else that you're looking for accessibility, you might get more results that you're looking for. Everyone will tell you macros aren't great. But hey. If you genuinely need them to play due to some personal handicap, maybe someone can help.