The problem is that you are using the evil within as an example, but the black bars on the evil within are actually a sham, they are actually covering the top and bottom of the picture, the picture is made in 16:9 and covers the whole screen and the black bars actually cover the tops and bottoms of the picture and are over the picture. The order isn't like that, it's in native 2.35:1 so the image actually ends where the "black bars" start, they aren't hiding anything and the field of view is wider, to make the order not have black bars you would have to zoom in the picture which would cause you to lose the right and left of the picture as it'll be sitting outside the edges of the tv, lowering your field of view and causing you to lose the edges, just like the first pics in your op show. So yes it is a design choice by the developers to make it more cinematic and it does widen the fov. I hope i explained that clearly.
Edit: Basically the 3 top pictures in your OP explain it properly and the evil within isn't in the same aspect ratio so you can't use it for comparison, what you originally thought before the whole evil within thing was correct and the evil within is just different and has artificial bars added.
