It is generally what coaches do when they are trying to hide the fact they have holes in a half court team - usually based on not having top end talent in relation to their conference mates. If you can create chaos and hit some threes, you can win more than you lose. That was what happened with Mitchell coaching at KY, he had a few good players and a lot of meh, so he created his '40 minutes of hell' defense - won a lot of games, but got wiped out when he played really good will coached teams, and by the second year even the just good teams had begun to figure it out.
TN had some talent, but the more subbing she did, the less she got from her talent, and when the opponents got better it began to really fall apart.