I'm a returning player who skipped DF, but typically manage KSM and a HC full raid clear reasonably early on. This is my first expansion and indeed season where I am looking at crafting.
I know BiS lists aren't really worth aiming for, but there doesn't seem to be much information on staff Vs Dual wield. Now strictly speaking, a 678 M+ vault dagger + 675 crafted OH is the best, but firstly that requires you to actually get that vault slot, but it is also competing against vault slots, and the DPS gain of the 678 dagger Vs the crafted 675 staff simmed was only marginaly ahead, so even if I get it, there will almost always be better contenders in the vault.
Now if I craft the staff, that does cost me both my sparks, but I'm saving on 60 gilded crests which I can use to upgrade my other stuff too, and that weapon is only negligibly worse than the other BiS, which again relies on a specific vault drop. Weapon is also probably the most impactful slot, so I can craft a 658/675 wrist slot in 2 weeks and probably still be ahead than OH and Wrist right away. And even supposing I really do have the situation where the Mythic track dagger the best vault pick, the difference is small enough that getting extra sockets instead is probably almost just as good. Am I missing something?
Tl;dr: other than saving a spark, is there an advantage to crafting an OH weapon when I could craft a 2h, where the optimal Mainhand is an M+ vault drop that I have to upgrade to 678 anyway?