That is not true assuming that anyone who does not have to focus hands can increase their boss damage as a result of not focusing the hands. Because then the demo lock can destroy hands and have higher boss damage as a result of the ring. Again that's only assuming that everyone NOT doing hands has higher boss damage than they otherwise would as a result. In which case it's better for everyone to have a demo lock destroy hands. I would say it depends entirely on your comp, and how much boss damage is lost because people have to switch to hands.