I think what he's saying is that a renderer that works in such a way is the most physically accurate. Yes, it's possible to fake things using certain techniques in software pacakges to make things look photorealistic, but that's not the point of this particular renderer - the point is to make something that exactly mimics the way that real life works, out of the box.
Sure winOSI may be slow and unweildy and inferior to other artists' solutions, but that doesn't matter to these guys. I think it's more along the lines of (for example) industrial car crash simulation software vs. dynamic simulations in Maya. The industrial simulators are very very accurate, but not very useful to make movies with. Maya's dynamics can be used in a way that looks excellent, but is not necessarily totally physically accurate. I think the winOSI guys are striving for physical accuracy over artistic utility.
It is theoretically possible to render a scene photorealistically with an approach like WinOSI's, but not with raytracing, and definately not with REYES or scanline algorithms.
I think what you meant to say that it is impossible for YOU to do it.
The artists doesnt blame the tool when he fails.. he learns new ways to get to the goal.
People like you just want a MakeNiceLookingImage button, *sheesh*
And my point is if realistic simulation of light is so important then why do proffesional photagraphers and filmmakers hire people to adjust lighting? Why not just use the natural light that is available everywhere?
If light going through glass is important why dont you ever see proffesional photo's of sphere's on checkered planes?
My point is this is alot of stuff that might happen in the future, but when it does the results you will be able to get from it will be not only useless, but not noticibly different the "fake" way of doing them.
People that do architectural visualizations for example is who I am talking about. They never know anything about lighting and eather just turn on radiocity or put up a few randomly placed lights and hit the render button. their work allways looks flat and uninteresting.
You havto learn about how to MODEL WITH LIGHT. You cannot just find a solution that will work with the push of a button. A normal spotlight in blender is more or less under the same laws as a real life spotlight. if you dont know how to use eather one your photo's or renderings will eather look like crap or look uninteresting.