As a second thought experiment, I realized that the incentives for "benevolent AI" and "malevolent AI" also largely converge (i.e. in both cases keep us pacified and distracted, also very much like we're already doing to ourselves).

Efficiency (assuming time-efficiency here) is only helpful to the degree that it doesn't reduce the chance of success. Doing it much faster would certainly provoke suspicion and resistance, i.e. the one thing you can't afford.