The RNG of DoT's isn't any less of an RNG as it was before though. Also, I don't know why your so peeved at bloodletter being linked with RoD, why would you want to use bloodletter in a AoE situation anyway? Pre 3.0 you never put DoTs on mobs in an AoE situation, so you never used bloodletter anyway (well you did but every 15seconds) so it makes absolutely zero difference.
EDIT: Pre 3.0 Wide Volley was a 15% chance to proc RoD. This means on average every 6 Wide Volley you get a RoD for free... on average. 6 x 2.5 Seconds is 15 seconds. Which is the cooldown on Bloodletter/RoD. So if your DoTs reset RoD just once within 6 Quick Knocks (Because you should be using quick knock now) you gain dps.