The advantages of the RB over a view camera, as I see them.
-Can be held in the hand easily (good for portraits).
-Can focus rapidly
-Can shoot rapidly
-Rollfilm convenience (sure you can use it on view cameras too, but see above).
-Prism finders can be used
There are probably other advantages also.
All of the above equate to general convenience and ease for me. The only view camera I use, though, is a bigger monorail so I guess I can't speak for someone using a light field camera.