I don't know what could they do if they could use 6GB of that RAm.
I have say that is not for the memory, it's because the orientation. It's because the concept of the console itself.
I don't want to pay for things that I don't care, like Kinect, sharing options, videochat...
I thought that PS4 had left all this things behind, using the minimum for this, because it was going to be "for games" or "for gamers" or whatever.
But I see that they are more interested in what MS could do with his multimedia device than be 100% game