Even in a for-kids/for-youth book collection, where we used to have Jack London, Jules Vernes, James F. Cooper, Alexandre Dumas and so on mixed with more specific children's literature; I looked at the current catalogue the other day: such authors have been erased, and the whole offer is now made of novelisations of Star Wars, novelisations of cartoons and novelisations of comics... Oh you can still find them in other collections, but those are a bit more, how to put it, distinguished/smart collections (and aimed at a bit older age); so that was quite a shock to browse the catalogue of the 'standard' kids collection.
Can you convince me that any of those assertions is wrong? Pointing out that "YA fiction is literature" doesn't come anywhere close to refuting any of the above assertions.