Besides the snappier interface, performance, and deeper incentive system, there is also just no chance in Hell of a site like PM, that was never Internet popular even at its peak, competing with the foot traffic and visibility of SO/SE because it has unlimited topics and a family of more than 100 sites creating cross pollination and user stickiness. It's the best idea online since wikipedia. It's a shame it was socially engineered by [string of personality pejoratives only appropriate to 4chan redacted]. I can see its value. I cannot enjoy SO in particular. Some of the other SE sites entertain what comes close to actual discussion, humor, and original thought.