They don’t have to play with the engine.
Just set some standard values for vertical and horizontal FOV depending on 4 big aspect ratios. So that the game looks good on all 4 not get benefit on 16:9 horizontally and cut the corners on 16:10 without adding some vertical FOV to respect the aspect ratio.
16:9 has a massive advantage over 4:3 in this game.
Try to go back to 4:3 and check how much horizontal you lose and you gain nothing vertically.
Let the developers talk don’t attack my idea just because you can, especially if you are not a programmer or game designer.