Words like "fat" and "idiot" and "ugly" have been removed on the basis (I assume) that they might encourage impressionable youngsters to be abusive and judgmental.
However there has been vociferous criticism of the changes from all and sundry, including the Prime Minister and the Queen Consort. They defend the original texts and don't see why they should be altered. They say the changes mute the vigour of the books, which thousands of children are still enjoying, although Dahl himself died in 1990.
Surely it's all rather a storm in a teacup. I can't see what's wrong with a few reasonable changes to his books to reflect modern life and remove possibly offensive language. It's not as if Dahl's books are being totally rewritten and turned into something unrecognisable as his.
Anyone who objects to the original texts is free to stop buying them and find something more "wholesome" for their kids to read. No one is forcing them to read Roald Dahl. Why not keep printing the original versions for those who enjoy them, and just ignore those who don't?
As far as I know, none of his extensive family have objected to the changes. It would be interesting to know what they think.
PS: Books are routinely altered, and sometimes totally rewritten, after a publisher's editor has looked at them. But nobody complains about that.
PPS: Puffin say they will in future publish both the original and amended texts.
PPPS: Alice in Wonderland might need some changes, especially to the Red Queen who keeps threatening to behead everyone!