In the end, right now we have the full control over how the guns look in the game while being able to offer the beloved Field of View slider and letting you play the way you want, with the complete resolution and FoV freedom (The Astronauts)

Instead, If you struggle at spotting and aiming enemies at a mid and long range, a lower field of view value will benefit your gameplay. (Esports Tales)

If the field of view is significantly different to what the eye/brain expects to see, it can result in motion sickness. This can be extreme, resulting in nausea and disorentation strong enough that play duration in excess of a few minutes can become impossible. (Game accessibility guidelines)