Another aspect is that the morality of stories would often seem questionable nowadays. I have a collection of fairy tales from around the world, and I remember trying reading some of it to my son. Randomly choosing some Indian story about husband pressured into deceiving a bear to work for free and then stealing some pears from the neighbor's garden. The bear was later serendipitously scared away by the the couple and received no reward for doing the chores (the bear didn't do anything bad to them). That whole story just got weirder at every turn. I was waiting until the end, I was hoping the author would make a sharp turn and rectify all the injustice, but it just ended with the perpetrators celebrating their ill-gained profits.
Well, this story is from a different culture, different time... but, I also have Beatrix Potter's collection of short stories for children (which is only some 50 years old and is definitely from the Anglo world), and uhm... I do struggle to explain some "turns of the tongue" used in these stories to my son. And it's not because I don't know what the author meant. It just makes me feel uncomfortable that the author thought that describing someone as fat was clearly intended to portray them as stupid. Or how whipping mischievous children was seen as a virtue, and that the character suggesting this be done to Ms. Muppets' kittens was the virtuous one, whereas Ms. Muppets was a lousy parent (for failing to do so) in author's opinion.
I'm still against editing the old books, but I'm also against using them in the same capacity as they were originally intended. I'd rather have them as historical artefact presented with modern commentary.
Anyways, I wouldn't be able to go into details in this answer as there are many, and many to explain. I found this summary which you may find interesting: https://www.abebooks.com/books/the-gruesome-origins-of-class...
One that particularly stroke me as exceptionally sadistic is the Bluebeard by Charles Perrault (a contemporary of H. C. Andersen and with similar acclaim).
I read perrault too, including bluebeard, and enjoyed it. The only book I can remember being really scared of was an illustrated version of 'the spider and the fly', which is not a fairy tale at all (though it is rather lovely). Movies tended to be scarier ('wallace and gromit' comes to mind), likely on account of the more vivid imagery. And we see now how dangerous video can be, especially for small children, in the form of youtube and tiktok; worrying about how scary a story is seems like trifling nonsense when the real danger and harm take a completely different form.
That said, my little sister seems to have been much more sensitive to scary things than I, at a given age. At ~10, she gave up partway through both the lord of the rings and harry potter, despite being rather taken with both (whereas, I read lord of the rings at ~5 and harry potter at ~12 with no problem). So I don't know; maybe I was unique. n=2; draw your own conclusions :)
They were sold 'raw" (uncoloured), enameled, or hand painted.
These are classic examples of you can't trust the name.