I offer a philosophical aside for your consideration.
I wonder what concept of ‘realism’ you are using and what values it embodies. A more ‘realistic’ VR—if that means simulating, evermore faithfully, the realities we already create through the senses, cognitive apparatus, memory and imagination—may be a misguided ambition. Throwing a veil of illusions too easily confused with the reality evolution has already fitted to our survival needs may not be a good idea. ‘Perceptual enhancement’ may be a better ambition for VR which has the potential to enhance fitness for survival by transforming and expanding realities.
thank you for interesting answer, I think the elimination process is a fantastic idea!! I am quite curious about focusing on this particular ''state of flow'' that you mention, I have come across this concept in multiple research papers that discuss VR already, linked to concepts of 'technology withdraw' or concept of 'embodiment'. I feel like these would be very useful concepts in determining the state of full immersion, yet I am not completely sure yet, in what context to use them in my work. I am currently looking into measuring the adoption possibility of this technology as well, as many research papers already tackle the question of VR in tourism and I want to bring some new insights. Have you got any knowledge of TAM (Technology Acceptance Model)?