Idk, this thread has potential to be serious, but it was made on April Fools day....
Anyway, personally I use double shadowfangs, even though I have a Goblin Skrewdriver sitting in my bags. A dagger offhand deals miniscule damage compared to a heavy speed offhand. Shadowfang can hit for 250 in the offhand, which is great for killing blows. Also, Haste & Slice and Dice seem to go further with slow speed weapons....
Which brings me to my next point, nobody considers haste to be BiS. Also, is Gloomshroud BiS, or is Blackened Defias Tunic BiS? Why are these "BiS" rogues equipping Cloaked Shoulderpads of Agility? Is 4 attack power really worth 10 stam, 7 haste, and 1 crit? Glass cannon can't be best in slot, it's just not viable.