What is the proposed application of NeRFs? It seems implausible to me that they will offer better practical performance than other rendering techniques for something like video games.
Radiance fields are basically photographs that you can move around in (within a limited box). They are especially effective in VR. But, they are huge files. NeRF is effectively AI magic compression for radiance fields.
Automatic, visually accurate 3D visualization of real-world objects from a few images.