If any further demo of why 6DOF is necessary for realism, it's due to the inability of dev, to date, to give a sense of steroscopic view in games.
Try this experiment: put your hand vertically (as a shark fin) in front of your eyes, between you and something small (that is a few meters in front).
Focus on your hand---->you don't see that small thing behind your hand, your hand looks solid.
Focus on infinite---->your hand looks half transparent, you see that small thing behind it.
It's exactly the same with cockpit bars, when you focus on them you should see them, when you focus on infinite you should see the sky behind those bars.
Since this effect of stereoscopy is missing in every simulator, 6DOF is the "easy" solution to overcome this omission, you lean to see behind the bars. Same can be done on some aircraft with shift+F1 even in 2DOF, but not in every aircraft (shift+F1 leaving one or more bar in the same blindspot direction), plus the abrupt transition is (imho) much less immersive.
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