I don't find 1st person all that immersive. The view I see in the game looks incredibly boxed-in compared to when I simply look around in real life (the REAL 1st person view point). Maybe if I were to use the console to open up the range somewhat, but I still don't think it would compare. Peripheral vision is just not something that's really able to be adequately simulated on a 2D screen, so until we get into the kind of technology where you're essentially surrounded by what you see, a computer will never really be able to adequately display a realistic 1st person viewpoint.
OK, so let me get this right....
1st person view is less immersive because you can`t see your peripheral vision, even though you could just turn your mouse and stick quickly to make up for that, but it would be ok if we had a surround visual system...
So that`s why you stay with 3rd person which has you 10 feet above and behind yourself and that`s NOT more unimmersive than having a view which is more true to looking through your own eyes?
Now tell me the REAL reason you perfer 3rd person.
I`ve had some people say they play in 3rd person because 1st person is too scary, especially in dungeons where something can actually surprise you.
1st person is more realistic and immersive than 3rd, no matter what excuses people cook up to try and pretend 3rd is better.