It's been said many times before: Inferno is not the super eyecandy mod. It's out there to be enjoyable to play not just to look at.
While mediavp grade additions would be welcome by many, it would likely delay the process even more and probably induce some serious feature creep.
(I don't speak on behalf of the team of course, but this is my general opinion on the matter. IMO it would be applicable to many other mods with long development histories as well.)