What do you mean that you have to turn your head? How small is the FOV?
As IRL I need to see (and read) the instruments and e.g. the runway at the same time.
Flying in VR while having the FOV of diving goggles is a realism and immersion killer.
Complex question… With regard to your remark about being able to see everything IRL, well, you can’t and you can’t… sure you can see things in your peripheral vision, but you can’t necessarily read them until you move your eyes or head.
In the VR hoods, the lens works best directly front and center, so unlike real world, as you move your eyes away from center things can get a bit blurry. This varies by the quality of the headset. I’m using a Valve Index and it is really very good, you have to be looking pretty far off center before it gets blurry. The FOV is around 120 or so degrees, so wider than a scuba mask for sure, but not full human perception, not even nearly.
The issue with glass cockpits is that some of the text is just to small to accurately see without leaning in a bit. Round gauge planes are much easier to deal with. The g1000’s in the piston planes is pretty good, but the airbus, CJ, etc, pretty hard to enjoy on the current vr tech.
I’ve once tried Aerofly FS2 and DCS with the Rift S (don’t know the FOV), but while the general immersion was great, the constant head turning was an immersion killer for me.
The low res and narrow FOV made flaring actually more difficult than with the tack sharp textures of a 2D screen.
I had an original Rift… yeah. We can agree on that. Blurry,
Things have moved on a bit from that. But it is still an infant technology and not really moving along as well as I’d like.
If you can imagine the image being about 3x more clear and about 20% wider, that’s where the Index is. It is still very far from the quality of a screen.
Nevertheless this doesn’t sound too bad. 
It’s useable and enjoyable with round guages… but like I said, glass planes aren’t too good.
In the JF Arrow, or the Carenado Waco, it’s friggin great… It feels so real. It can be overwhelming.
In the glass cockpits tho, its really difficult. The default Caravan is ok. The G1000 C172 isn’t terrible… but I usually fly the round gauge 172 since those are the ones I had access to in real life. The round gauges are just fine. In the Index.