Maybe it's too dangerous. Still in all, it makes one wonder why?
Even shows that are "live" are usually "live to tape". This is to allow editing -- for commercials and other video inserts.
Thus, for purposes of timing and camerawork, virtually everything is rehearsed. That way, everybody involved -- on-camera talent, directors and cameramen -- can all know who will do what next.
Working on the skinniest of budgets, it still takes about three hours to tape a thirty minute show, live-to-tape.
I suppose they must appear polished above all else, eh? It wouldn't do for our Ministry of Truth to appear to be anything but perfect. They have an image to maintain?