Aka dealing dmg / casting cc doesn't break camouflage. It's similar to the Shroud of Concealment bug for Rogues, EXCEPT THIS IS PERMANENT LOOL.'     
Vid proof:   
https://www.youtube.com/watch?v=R2AOX4PcC-o   
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Define useless? This is arguably the most broken bug on Pandawow right now, what i understand from your name is that you're a Hunter and obviously you would like this bug to stay, but this bug is fucking retarded.   
If you're gonna be biased, be biased somewhere else.