You either get rid of it altogether or you don't
It's here to stay unfortunately.
Personally I don't use it. I actually find it confusing as my first instinct when taking damage is to hit the armour button, which (when AA is enable) actually removes my armour and causes me problems.
It's a shame that it preemptively stops damage. It would be better if it had an activation delay of something like 0.1 or 0.2 seconds. In that situation I could totally support it because it would potentially be inferior to activating the armour yourself.