First person experience doesn't mean "simulator". It means feeling like you're there, which is the opposite of 3rd person arcade experience. And to extent that this lack of immersion can be avoided, I believe it should be.
In the case of the gunnery position, it can't be avoided. So it needs to be accepted as is. Unfortunately.
How else can the developer present a view for the gunner where they can't either see what they are shooting at, or the relative position of the ship.
Apart from using actual player-manned turrets (so one sits in them) there is no good way to do this where the gunner can have good situation awareness - in first person.
And first vs third person has absolutely no bearing on immersion. It's how seemless the experience is. How engaged you are. How much one can see the plausible and accept it over the reality.
VR works not because of first person, but because all the senses are fooled. It's using the player's senses against them to create an experience. Be it first or third the brain is still tricked due to the way VR works - this is just an example.
There comes a time where practicality of a thing still has to be a consideration. There are only so many ways Frontier can do this and due to the way hardpoints work, and the limits of what 3-4 players in total can do, of which only one is a gunner, this is what we get.
People are trying to take the hill on this because it's third person. Which is ignoring actual ship design limitations and practicalities out of a misplaced belief system.
I'm all for improved options but if they ignore the reality of the way ships are built and the limitations actually present then it's utterly arguing for the sake of it.
And quite a few threads since 2.3 was announced very clearly wish to argue the merits of a system whilst completely ignorant of actual game limitations.