I sincerely doubt it is oblivious to them. They just realize, most likely, that this "problem" can be circumvented by using the ability in an intelligent way rather than just pressing the button and "hoping for the best."
Don't get me wrong, some pulls I have to go ahead of the mobs being pulled then aim the barrage either at a wall or facing the way from where we cleared trash. But not everything is going to provide perfect quality of life.
Unless I'm not understanding the problem to the full extent, I've never found myself pulling extra mobs without it being a derp moment on my part. And that's not a reason to change the ability.