Not really, the game balance is still there. A decent BST can solo things even without dual axes just as easily as DNC or NIN/DNC can. In fact, we can still solo things that they can't without too much trouble. I've seen testimonies of people soloing Dragua on BST, no brew. When a DNC or NIN/DNC can do that, show me, I'd love to learn so I can solo those cards on my NIN.

The point is that every game has its niche. BST already has a lot of power and potential to it without needing Dual Wield, enabling them to solo a lot of powerful monsters that most jobs would have trouble soloing short of brewing it. We don't need Dual Wield, we've got plenty as it is.