Then you are seeing some terrible Anas, the sleep dart is a core component in her kit.
Although yeah I agree the cast time on Pacify is not necessary, personally I would like it to be a projectile with a travel time slightly slower than Zen’s orbs but faster than Pharah’s rockets. Sort of a shoot and forget ability where you just throw it and then go on to do your own thing. Either way, I don’t think we should focus particularly on the function of the ability since if Blizzard decides to use it they will figure out the best way to implement it to the game and if not it can be adjusted from there.