Her writing simplistic is the very reason people like her books, though.

I also think your "People who really enjoy reading" comes off as very arrogant. Some people might have not have the time to read as children because other duties kept them away from it, some might no have been encourged to read and are only now developing that skill and might feel intimidated by the big classics. Some youngsters might read the books because of Tik Tok but where I live they are often bought in the English Edition and here it helps that they are simple because they can improve their English Skills while at the same time read an entertaining story.

Anything that gets people to read is a good thing in my opinion and should not be looked down upon as "mindless thrill" but a book like any other.