Applications of these things, meaning application of such cameras that have motivated to this topic, include teleconferencing, where you are talking to lots of people participating in a conference and the conference being broadcast to the other end. So if you have a single camera you will have to be moving it all the time to point to the front people, whereas if you have a single ideal camera which is only directional and only focus, and everything, then you do not have to worry about these things. You just have to select the right person after the fact, the user has to select what is to be transmitted, not acquire information about was is to be transmitted.
So teleconferencing is one example, surveillance of supermarkets, for example. Namely you would want to decide what you want to see, but you are acquiring the information any way.
Inspection and monitoring are again similar motivation.
In consumer photography you would want to perhaps create images in which the photographer is not constrained by the configuration of the scene for example you do not have to ask people to come together, so that you can take an image. People may be scattered all around and you just click the button and everybody is captured wherever they are, near or far, left or right, up on the roof or on the floor, or on the tree, whatever. So there is no special limitation or depth limitation. Also you may be imagining in bright sunny day, where you have the sun in the background.
Visual art also will benefit from such cameras, because you can use these various capabilities of the cameras to produce new images that have new features, new combinations of features. You can add images, in ways that was not possible before, because you did not have the data.