Because all the perfect-IV shinies that were obviously bred and not hacked are going to return to the online battling scene.
Not looking forward to hacks coming back :/
Given how easy it is to get a five IV mon in X&Y, I would hardly say it makes any difference. In the end of the day, if you really can't tell the difference, who cares?
I don't condone hacking or pokegen or anything, but I really can't see your point here.
RNG is legit enough and the hacks are being blocked are they not?
I can always battle with my honest friends :).