As far as I know Heroic dungeons were once created to be the dificult version of an dungeon but let's be honest here they are anything but hard and quite frankly that honor has now gone to challenge mode.
So that now leaves me to the question what's the point in heroics anymore? Besides adding another tier of gear to add to stats bloat. s they now seem as maybe slightly more difficult but still zero effort required grind fests now.