Occult Acumen is a great idea to give to blms. I am a career blm but the sole problem with Occult Acumen is that we blms, have a staff for every element. I know that this seems like a bad idea for giving this to blms, but if we had one staff to nuke in for all elements, IE Laevetin, I for see the blms dot damage being higher. I know that getting a mythic weapon right now is out of the question for almost every blm considering the time restraints and money factor but this is still fun to think about. I for one am in the process of obtaining the blm mythic for a chance at a one blm one staff deal.
Before I get on the wrong side of people who think this is a bad idea, I do agree with you, this job trait does not work for us. I have a kiting staff, magian trial staffs for all the elements, HQ staffs for binds gravity and burn, pluto's staff for sleeps and resting, and a scythe for aspir and drains. In the heat of battle that staff is going to change.
Those of us who want strive for the perfect blm, this ability is pretty cool as it opens up new ways of combat. And by perfect, I mean having a mythic weapon O-O... Who knows, maybe at lvl 99 they will combine all the elemental staves into one staff thus making this job trait pretty cool, even without a mythic.
A taru can dream