For example, when Disney Plus was new, I decided to watch Peter Pan with my kids. One was 4, and one wasn't even two. Curiously, I couldn't find Peter Pan in the "kids" mode, so I switched back to the adult mode and put it on. There was a very subtle warning about "outdated cultural references," but I didn't think much of it as I've seen Peter Pan a few times.
The Disney Plus version reintroduced "What Made the Red Man Red?", an extremely racist musical bit. (https://en.wikipedia.org/wiki/What_Made_the_Red_Man_Red%3F) In the past, this song was cut from the VHS and DVD version. (And I have vague memories of wondering why the lost boys returned to their tree dressed as Indians.) I had no idea that this was put back in the movie. My jaw dropped when the song came on. I was in so much shock that I didn't think to skip the scene.
Now, I have no problem preserving the uncut film, and making it generally available! But I also would prefer to show my young children the cut version of the film, and only show them racist material when they're old enough to understand why it's wrong. (After all, those who forget history are doomed to repeat the mistakes of history.)