Do you want to elaborate on this supposed flip flop? 'BABIP is likely even more important when evaluating pitchers because they have almost no control over what happens to a ball once it is put in play. A pitcher can control their strikeouts, walks, and home runs, and through those, the number of balls they allow to be put into play, but once the ball leaves the bat, it’s out of their hands. As a result, pitcher BABIP is heavily influenced by defense and luck, which means the number of hits a pitcher gives up is influenced by things outside of their control. And if hits are somewhat outside of a pitcher’s control, so will their runs allowed totals.' This is a long way of saying that pitchers with a high BABIP are most likely victims of poor defense or bad luck, and neither is the pitcher’s fault. Their defense might be attached to them, but their luck is not, meaning that we typically expect most pitchers with extreme BABIP values to regress toward league average going forward. This is not to say that pitchers have no control over the quality of contact against them, but research has shown that they have very limited control over whether a ball that is put into play becomes a hit.' These things have been said about BABIP for a long time. Perhaps it's just your misunderstanding of the stat that's complicating things. As far as you assertion that it is NOW being used as a measure of a team's defense, that's just one part of BABIP. So no, it's not really being used as a measure of a team's defense, because a clear cut single or double is just that. That's not to say that a team with better defense won't help a pitcher's BABIP (in the way of turning fringe hits into outs), it will, but there are other factors so it can't all be on the defense. And it still doesn't change the fact that once a ball is in play, what happens is almost completely out of the pitcher's control. So there's no change there either.