That's because FFXIV is not designed around the classes doing anything else you ape. That's my whole fucking discussion point. Of course it would be shit in the current system because a BRD is not designed around just playing songs all day.
Holy shit you must be doing this on purpose. I'm saying I personally find it a major gameplay flaw of FFXIV to offer zero class diversity within a single given class. The system works for some people, but I dislike it.