I wish they made aggro management more complex, and dynamic. Though at the very least since I have been playing aggro management has been overall nonexistent, maybe it "could" have been a issue when you ran into a group that refused to use aggro dumps and as a tank you were pushing for max spa. Though even then aggro management was not so much an issue from a tank perceptive in the eyes of the devs since we had tank stance, only was an issue when the tank wanted to do max dps and the their team could not be bothered to use aggro dumps and forced the tank to use an extra aggro combo.

In short SE will not give tanks more personal responsibility in the form of more dynamic and active aggro control for the same reason they will not give healers more doses options. They feel making the easier less to manage will make it more welcoming.