I have tested all the elemental weapon buffs from powers and items I could get my hands on, applying them to my duel-wielding Champion and Brint, I've found out that across the board the extra damage from those damage buffs doesn't seem to apply to the off-hand weapon. Conversely, any Attack Power buffs you get apply fully to both weapons, making Blessing the most viable option - on top of its inherent advantage of giving a party wide buff the potency of which doesn't depend on user's spellpower.
With the exception of Dual Blitz, no weapon power that delivers a more powerful blow utilizes the off-hand weapon, making the extra demage output you get from it even less impressive. You don't seem to get extra rolls for applying the powers' associated debuffs, either. You essentially sacrifice accuracy and defensive capabilities for very little gain.
Is all working as intended? If yes, is there any chance some of it might be changed or tuned eventually?
With the exception of Dual Blitz, no weapon power that delivers a more powerful blow utilizes the off-hand weapon, making the extra demage output you get from it even less impressive. You don't seem to get extra rolls for applying the powers' associated debuffs, either. You essentially sacrifice accuracy and defensive capabilities for very little gain.
Is all working as intended? If yes, is there any chance some of it might be changed or tuned eventually?