BLU is a bit different, and always has been. Collecting abilities has been a major side activity in games in a way that no other job has had, which is exactly what XIV has emulated. And by the sounds of it, they did try to put BLU into the traditional job formula and it didn't work as a BLU (which is understandable, it has no identifiable theme other than collecting enemy abilities), so the main gameplay that they took is the side activity that makes up the identity of BLU