The local minimum point is correct I think. Finding the true maximum of a highly multidimensional quantity is fiendishly difficult. If A/B testing were sufficie

The local minimum point is correct I think. Finding the true maximum of a highly multidimensional quantity is fiendishly difficult. If A/B testing were sufficient then so many human and universal problems would vanish. So I totally agree with the article: you can polish with A/B, but unless you're pretty happy with the neighborhood you're in it's not the only tool in your belt.