It affects all 3 specs, but we changed Arcane habbo taler and Explosive to offset that some, as well as fixing a glyph that was hurting Marks. Steady was just a huge portion of hunter damage, and not a particularly interesting ability (in that you can just sit there and mash the button without worrying about timing other abilities around it), so when we wanted to bring hunter dps down, it was an attractive target. FWIW, ammo was another one. We considered nerfing how much damage all ammo in the game contributed, but went with the SS change for the reason I stated.