It would cause clipping issues with cloaks, also the daggers would be less visible which goes against Wow's style of having huge, extravagent and highly visible weapons.
I would love also, an option for the offhand daggers to be wielded backwards. Mainhand for stabbing, offhand for slicing. : D
Icepick grip would be cool, but I animations would have to be totally reworked. Unless they just had rogues holding in that grip when weapon was drawn but not fighting, and we flipped it for fighting. But that's a lot of work for some small flair.
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