Don't forget that any cuts and readditions to the negative means that the adjoining frames are destroyed in the process. So, even if entire scenes are in storage somewhere unaltered, we still can't escape the fact that the film as a whole has irrevocably lost a great number of frames that were present on the original cut. If anyone does a restoration of the OOT and thinks to fix that, they would have to find those frames from sources other than the o-neg (so, interpositives or the like), I'm sure they can make it look acceptable, if they realize what's missing.