Re: Been there, done that
I was actually manager of Immersive Virtual Reality systems at IBM around 1995. The technology was based on Virtuality plc's headset (and also v-flexor a five finger hand device) bolted to an IBM PS/2 with half a dozen RISC processors on a card. There was a anaethatist traning app, a channel tunnel driver app, an airbus plane layout app, and a bunch of games. Nothing I have seen is new - just the resolution got better. Latency was minimal and had directional stero sound.
Engineers - always want to produce a new version before you have recouped investment on the last one.
Lawyers - little Jimmie uses VR and now needs glasses (would have needed them anyway) - class action lawsuits!
Also anything with opticals and electric field sensors is finicky - lots of service calls.