Who does them?

I know DC advocates them for fascia stretching, recovery and injury prevention.

An extremely experienced friend of mine has been doing them for quite some time and recently he was doing the chest stretch and snapped his supraspinatus (rotator cuff) completely in half. IMO thats quite detrimental to gains lol as he had surgery for re-attachment and is now 6 months out. Im re-assessing risk vs benefit.

Any thoughts?