There are 3 main reasons companies lock down the FOV (to a too low value)
-performance (making the game run faster ... by limiting the users ability to choose this setting higher)
-related console versions (FOV on consoles is smaller due to a different typical screen-sitting position ratio, and they have stricter requirements)
-actual design reasons (like a fair playing field in an RTS, or due to carefully prepared cinematic sequences, due to UI element placement depending on it)
Since the 7DtD run totally fine when setting the Fov higher (via console), when the user has the required hardware, the decision to remove this option is just paternalistic.
It would be enough just to set the default to that low value, but let users decide how they want the game to render.