Dagger mainhand is great versus mobs and veterans in open world because it is 2 targets, ranged self-heal to open with while running to target and have a barrier with Blood Bank, and immobilize to use on running away enemies like bandits and centaur archers.
Dagger offhand is also good at early levels to have a condi transfer until you get something else for that.
A friendly reminder: Anet is highly likely to know better than you.