Played enough privates to see that the game suffers from more balance issues as a result of it being turned off [AutoA].
Crytek built the Weapon Balance Around the inclusion of this feature. Play enough custom games without AutoA, and see how campy everyone gets as a result of the natural fear of dying too quickly from just about half the guns in the game. There is no way to preemptively play with Armor ON at all times, and the deaths will be unsatisfying and too frequent as a result of not being able to freely navigate the much larger maps. Trust me, I have seen enough. So before you cry about removing Auto A- get a bunch of elite players in a room and see what happens and how fast you die as a result of it being off, that is if you were the type to go all out playing as if it were Crysis 2, and only turning armor on Proactively in a sure engagement and not to ward off bows and scar sniper shots.