I think this same issue was fixed in DayZ SA quite a while ago. Since it disappeared from "known issues" notes, solid objects like walls, and iirc trees and other objects as well, would limit the angle of lean you can perform towards them. Still works on doors, though, but that is very minor problem. In A3, though, you are able view through walls somewhat easily and reliably, which is a huge potential exploit. Kinda ruins the big improvement in A3, enterable buildings, too.

I'd say the problem is simply that the player character in first person, on game client, doesn't have a head model, although it does have a body model. No collider on the camera object either, so no collider to be blocked by the object like walls.

Whatever the issue, they already have a decent fix for it, as seen in DayZ. I'd say either they have some reason not to use it for A3, or then the person who reviewed this did so very carelessly. But they should definitely re-review this asap.

4.3.2014, either build, still able to look through walls easily and effectively, both left and right, with a rifle in hand. Right shoulder might require an additional strafe towards the wall while looking and leaning at it, while left doesn't, but still very easy to pull off either way.

Not sure if "minor, visual" are correct descriptions here, this is actually a quite serious gameplay issue.

I don't know about others, but my conscript training included using the rifle and other gear to bludgeon people's face in. And capturing people with ganky takedowns.

I think the game could really use some options that don't involve bullets, although bullets are the most important aspect.