Second Life was just another window in your computer. VR (or AR, XR, etc.) is new hardware paradigm for displaying stuff. Edit: not really "new" – first AR/VR

Second Life was just another window in your computer. VR (or AR, XR, etc.) is new hardware paradigm for displaying stuff. Edit: not really "new" – first AR/VR display was in 1968 by Ivan Sutherland, but current tech allows us to have standalone device with good ergonomics and plenty of performance