In the old days it would have taken one hell of a whack to break a wooden stick. Since this rule was instituted, these sticks have become even more flimsy making this rule a joke. A player sets up to shoot and a stick will fall apart in his hands.
However it is a rule and like any rule it must be called consistently or dropped.
The rule is like 9 years old, so I really don't know what you are talking about.
It is an extension of the 2008 finals when Pitt slashed the stick out of a Det Dmans hand, and there was no call. Pitt ended up scoring because they essentially had a 5 on 4.