So much of our reasoning is abstract and removed from immediate physical reality, and VR alone may very well prove to be a powerful tool for understanding, reasoning, and conceptualizing these things. Even when I'm designing physical things there often isn't a real-world context to relate them to, yet. That is-- the jury is out on how much augmented reality is necessary to be "useful" versus immersion/"escapism".
And even seemingly escapist things can be great for increasing intuition or our strengths in reasoning about things... witness Kerbal Space Program or Poly Bridge.
I really like your argument concerning reasoning – especially considering how we can experiment with the "shadows" of four dimensional shapes in VR. Science, research, reasoning – all very likely to be revolutionized with VR.
But in daily life – always on – I believe AR will be as common as putting on shoes to protect our soft feet.
And even seemingly escapist things can be great for increasing intuition or our strengths in reasoning about things... witness Kerbal Space Program or Poly Bridge.