[Brightcolours]

Lytro doesn't really market this camera for solving focus issues.

Indeed, it is not designed to solve issues, just designed to pursue a novel idea: making images where one can "look into" with a 3D effect (on a computer, of course). Nice idea, just with limitations at the moment (low resolution, lens quality).

I am wondering about the application really.  There's no value-add for prints for instance.

When thinking about an interactive approach you may achieve the very same focus effect via existing movie capabilities - just keep your scene static while focusing from infinity to macro. During the interaction with your scene just move to the chosen movie frame.

Then you have to make software which enables the user/viewer to go through the whole range like the Lytro (web) software does. And you will not get the limited 3D capabilities. 

Thus what is left then ? You still have to think about the composition of your scene and the effect in any case thus you can't even argue with a simplification of the photo taking process.

What is left is the user experience in looking into the image with a slight 3D space. That is the only thing it does.