Not revising a film "based on modern sensitivity" is one thing, but what about films being released in a multitude of different versions right from the start? It annoys me when I discuss a film with someone else who's seen it and I find that some of the scenes in the version I saw were not in the version they saw, and vice versa. If you see a recent film on TV you can be pretty sure that you're watching a version that was specially edited to be shown on that TV channel in that country at that time of day. Sometimes you can look at the Wikipedia pages about a film in different languages and see wildly varying running times.
Not a recent film, but a while ago I finally got round to watching "The Exorcist" (1973) because it was on UK television. The "spider walk" scene was omitted in that particular edit!