Robert Zemeckis, you really hit the nail on the head this time!

I was watching Back to the Future Part I, with the second commentary, basically a Q&A session with Bob Gale and Robert Zemeckis overlayed on to the movie (with no relation to what's happening on screen) and towards the end, Rob says, on the topic of changing things for the DVD:

"I hate that. I don't think you should ever do that. That's like colorizing a black and white movie. It is what it is. I don't get this adding scenes back in, and recutting the movie. I don't get that at all. It should be the way it was at that moment in time. That is the way it was supposed to be."

Somebody tell George!