It is ridiculously unrealistic to suggest that a spaceship with technology capable of traveling across the galaxy, and either faster than light travel or some kind of space time bending technology (warp drives etc) could NOT also have advanced enough technology to enable a rear view or external cameras and scanners to enable the (visual) tracking of enemies all around you in real time.
It is obvious that there would be cameras mounted on the back and probably on turrets above/below the ship giving a 1st person view of every possible direction around the ship..
Again, it is totally unrealistic, bordering on stupidity to expect a ship, which is capable of such high technology to not have the simple ability as a rear view mirror........ ! If that does not break immersion then I don't know what will.
So the ships in ED will have very powerful on board computers when compared to today. They will most certainly have technology to track enemy craft and display a visual display to the pilot in real time. Not just a simple scanner.. but the tech WOULD be there to show in real time in a 3D space the position of all enemy craft relative to your own position in space...
Now assuming this was the case (which in the future it likely would be..) then I don't see how a 3rd person view can be much of an advantage, if we are trying to be realistic at all with the sort of technology a REAL LIFE ship like the ones in ED would be like. And that is trying to KEEP the immersion!!!!!!!!
So a 3rd person view most certainly would NOT be giving anyone an advantage.. and as for people who feel it would be immersion breaking, I guess you just need to stop thinking of these ships as being based on 2014 technology.. because in the future they will be using tech that you can't even imagine with such closed minds today.
EXAMPLE: when you are looking at the 3rd person view: that COULD be a computer simulation generated by the on board computer, using the data it collects from the scanners and cameras, which displays in real time your position and everything around you. See?? It's not that hard.