I agree that using Fracture is quite error prone. However I was talking about a rotation, that tis a steady state situation. Again, the idea is to not loose buff and debuff.

By the way, if he/she wants to test Fracture, why would you tell him not to? It is great if he wants to try it by himself/herself. Or maybe, he/she is on T8? And heck, he/she can also give a feedback on this. That is totally fine!