In virtual reality anything is possible, except... when it isn't. Choosing the right platform for your virtual space can be the difference between creating mind-blowing immersive experiences and frustrating your users because they can't access it with their technology.
WebVR has come on leaps and bounds and with Three.js based A-Frame, I can build virtual spaces that are accessible from to all users whether they are using top-of-the-range headset right down to in your browser. It even works on your phone!
However, when you are working with users who have access to their own VR headsets, that is when you can really create something special.