The stealth mechanic is broken!
The enemies's field of vision just doesn't work in like 95% of its totality. You gotta be deliberately looking for the small spot where you can start getting spotted.
Where's the stealth aspect in being able to stand and even run inside a vision cone without even a single hint of a penalty?
I tried messing around in the vision cones with all the camos, and all that affected was the rate of being spotted, so I think the cone just doesn't detect the player right.