With the player's comfort to consider and all of these limitations, how are designers creating amazing 3D worlds for VR users to step into? The answer can be summed up in the phase fake it till you make it. The technology behind VR is rapidly evolving. New techniques for dealing with the issues we've mentioned are being built into the next generation of game engines. However, for now, there are some best practices currently being used by artists in the industry today to deliver amazing visuals, such as the showdown demo from Epic Games:
These guys were able to render this amazing scene at 90 FPS. There is transparency, lighting, and visual effects. The models used are from various other UE4 demos and are not reduced in quality. Here is just some of how they did it.