I know that Enid Blyton’s stories have fallen out of favour with some with accusations that there were elements that were elitist, sexist, racist and xenophobic.
I was born in the early sixties, and grew up on a diet of Noddy, the Secret Seven, Famous Five etc. Yes, looking at them with an adult 21st century mindset, I can see things that we wouldn’t be comfortable with if the stories were written now, but for many of us they inspired us to read, and perhaps to write.
And having sold 600 million copies? Enid Blyton obviously appealed to a lot of people.