The problem is simply Slice and Dice, and how every spec is balanced around it... Can't sufficiently stress that it needs a heavy nerf or to be completely removed, at least from Assassination and Sub. It is the sole reason for the heavy spec homogenization and lack of spec identity/feel.
I still say change it too a haste buff instead of a attack speed one.
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I'm very confused as to what niche ST is supposed to fill. A ranged slow? A ranged CP builder? Just... a ranged attack?
Because it doesn't fulfill either one of those roles very well. Having a ranged CP builder doesn't really help a class that mainly focuses on white melee attacks. A ranged slow isn't too shabby for PVP needs, but the range itself is rather disappointing. Overall, it just seems like a generally useless talent that was just thrown in to fill the last tier 90 spot.
The OP's disappointing realization isn't as disappointing as the ability itself.
Situational pve use would be on fights where you will move a lot but never have to redirect.