I literally had this same discussion with an LS mate after finishing their Farsha last night.

I will say the same thing here that I said to her: Farsha is still the best option for BST, and while your WS damage will never come close to any of the higher tier Empyreans unless you specifically gear for it with Atmas, the Aftermath effect is going to make you come out far better in the long run.

Someone mentioned it on an earlier page - use Cloudsplitter as a means to proc your Aftermath and follow up with Rampage. Best of both worlds. I will agree that it's odd they gave BST another elemental WS rather than a physical one, though.

However, if you're going to be short sighted enough to say it's a bad weapon for the WS alone, I don't know what to say to you. I can understand this argument should you have wasted your time on the WoE version, but the Empyrean by no means is a waste of time.