It's use is focus regeneration. Hunter's passive regeneration is terrible outside of Rapid Fire, why would you want to limit the class when no other class is required to really cast to "regen" their resource constantly.
There are many different views on how they can limit damage from Hunters. Either bring back minimum range for all abilities except scatter, steady/cobra & silence, while making all others have a minimum range (I think someone posted this idea in this thread). Other idea's would be to keep no minimum range, but if the target comes within 5 yds of the Hunter their dmg is reduced by a %.
Overall I enjoyed the kiting aspect of hunter's during wotlk/cata (with min range), that's my view on it compared to now. I think there are better alternatives than to allow it to be interruptible.