Honest question: have you used it? Because if you did, you'd see its leaps and bounds better than clicking on a handful of links, scanning through verbose and poorly written answers in Stack Overflow, until you find the right one.
It doesn't replace SO, but it certainly complements it. Plus, it acts more like an assistant (and, per OP's post, "...who is often wrong - need to read their work thoroughly").
A lot of answers on StackOverflow are just awful -- the bar is incredibly low. I'm not sure SO will serve even a quarter of its current traffic by 2025.
