If you are trying to argue for what I think you are (I can't assume 100% since you only hinted at it), you think that since you can (if you move your head and eyes far enough) see your arms and legs, so it is superflous to have it rendered in the cockpit.
Using that same reasoning, since I have those items I mentioned, they don't need to be rendered either. Yank out the 3d models of the control column, throttles, prop pitch levers, rudder pedals.
The reason for body rendering is the same for rendering the control column etc. They are in a virtual world on a view screen we are looking at. If we had access to a full size sim-pit cockpit to sit in with a huge projector to encase us, then we could switch off the cockpit rendering because we would have no use for it - real physical objects would replace them. But very few people posess such a setup.
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