The fact of the matter is, if "there's a third person camera mode" is breaking your immersion, it's because you have never actually achieved immersion in the setting. See, this is literally a setting where realer-than-life simulated holographic reality is a thing. One of the most popular religions in the setting, for those who can afford it, is to pop yourself into 100% realer-than-real-life VR and enjoy a life of total bliss while receiving teachings from your Simguru. Pranav Antal is an example of this.
And yet, here people are, going "hey, in this spaceship game where my own ship accurately tracks the relative distances and vectors of other ships to the degree that it can simulate their noises as they move about, where the technology exists to completely immerse oneself into 100% undifferentiable from real life VR, it hurts my immersion that these two things might combine."
The third person gunner camera is a simulated virtual reality for your gunner that uses sensor data from the ship (which the ship already uses to supply sound, in case you forgot), to create a free-form virtually real representation in space (exactly like the navigational computer, in case you forgot about that too) which the gunnerthen uses to interact with space.
It is 100% Lore Consistent and if you're not getting immersed by it it's because you're not actually immersing yourself in this setting. If you don't like this lore, you should consider that this has been lore since 1984 and if it's not something you like, consider something like Star Trek? Although even Star Trek has holodecks so welp.