Leaning, on the other hand, does. It reduces exposure of your hitbox and makes it less likely that the AI will see.
You're talking about immersion and yet mention hitboxes and AI in the same sentence. So basically you're saying that immersion to you is about how the engine itself operates and not about the game experience, so obviously we're going to disagree. And as I've said before, you're just talking about the way that AI is programmed - it can be programmed to react the same way without leaning by determining visible area.
How is that "a fact"? Jumping, crouching and prone implementations in videogames are usually terrible and not realistic in the slightest. Immersion has more to do with the environment and implementation of features than the presence of features themselves.
Exactly. To me the embodiment of the player in the character and the environment is much more important than a button that tilts the screen slightly. But hey, what does my opinion matter? I mean, I only buy games - my opinion obviously doesn't matter as much as someone that pirates them on principle.
Far Cry 2 was let down by many of the gameplay mechanics and design decisions but it still did more for the genre than any other game I can recall in recent years. If Far Cry 3 can improve upon the formula then I'll definitely be getting it.