Cinema is unique precisely because it involves montage/editing and a single vantage with which to arrange (naturally this is not to narrow or limit defining cinema too much).
VR is best when used for what it name says: virtual reality-a simulation. Cinema derives meaning from selection, with a camera that can wander how may cinema express the singular vantage that choice makes? Not to say innovation and new tech should be ignored or discouraged, but as you said "limitation of space" VR has more qualities akin to gaming rather than cinema (and both are delightful and profound mediums of expression)
Read Rudolph Arnhiem's Film as Art (Film als Kunst), he lays out everything that film and VR/3D would be back in 1932 and it still holds up today (predicted 3D and Smell-O-Rama would be nothing more than fads).