I recently figured out how to do battle regimens around rank 28 and I was a little disturbed to find that they are actually rather easy to do and that I had gone all this time without ever seeing them used once, if you were to implement a tutorial with battle regimens in the first battle or rank 15 quest battles (both of these have npcs you could perform battle regimens with) I believe more people would use them, they would also make these opening fights a little more interesting.