It is not hard to position yourself using daggers and getting the backstab bonus. There are 2 scoundrel teleport skills and 1 warfare. With The Pawn, repositioning becomes free. Could you present the base values of an unenchanted basic endgame dagger and an unenchanted basic endgame sword? Evidently, they should be at the same gear level.
It shouldn't be compared to bows, as you cannot use a bow with a shield. You can, however, use shields with daggers, so I don't understand why did you bother to mention shield throw bounce as a plus point for swords.
My point being, from my own experience, that daggers falls off heavily compared to everything else. Crit chance isnt an issue since late game it goes as high as 104%! (depend on your luck) so it pretty much is garentee crit everytime. This is where your one hander sword becomes advantageous.