Earlier quoted context omitted.
Better customer experiences often times lead to increased metrics. They are not totally different things.
Maybe if you are very aware of the fact that your goal and metric aren't totally aligned, but that often gets lost. As a result A/B testing for longer website visits can make websites that make it more obvious that the information you want is there, but also make the path to actually get it longer. A/B testing for engagement might promote divisive behavior and fights. A/B testing for read rate or clicks might lead to…
It seems to miss the point to blame/stigmatize a specific tool because it's been used poorly by a few bad actors in a public way.