Punto, thanks for that I began to wonder whether I was missing the point.
The discussion is not whether you can stall a rotor. There has been lots of discussion here to do with energy management and what happens as blades begin to be worked too hard. All good stuff.
The original proposition is that this always happens at a singular known "ultimate" coning angle. That knowledge of this value would prevent such accidents. This is what I sense most people are uncomfortable with.