We don't need to we choose to im trying to complete a bounty not sit still and kill weak enemies. Sure I could kill them all but if I'm trying to do a bounty quickly then I don't care. I will however admit I only do a speed run on Devils lair I do all the other ones slowly but Devils lair everything is too weak to bother with so why bother. If you wanna kill them all go for it let everyone else do there speed run. I'll also admit it's a dick move to players who don't speed run but oh well everyone plays there way it's bad when it affects others but it's unavoidable