Let’s start this thing out with the guns blazing.
I hereby declare that most defensive metrics are garbage, and anyone that uses them alone to make conclusions about individual players usually have an agenda they are pushing or leave out a lot of valuable information.
There is an infinite amount of context and situational plays that can be left out in defensive metrics. More specifically, on a play-by-play basis. For example, player A could play incredible, perfect defense and force a near impossible shot, but the opponent makes it. Other times, player A can leave their opponent wide-open after a defensive breakdown and they simply miss the shot.