Eagle Vision and view point synchronization on the L3 button is the worst idea ever. It needs to be change.
When in combat you do a quick reverses on the L stick to get a quick kill on the next selected target and you end up getting hit because you popped in to Eagle Vision mode and you screen blink black.
L2 is a better place for this, Or change it back to Triangle and make Shoot the upper L2 modifier. While holding L2 you shoot, when not holding L2, triangle will revert to regular AC controls(Eagle vision).
when running and climbing even the slightest push on L3 changing you to Eagle vision is really a pain.