it's largely a commercial marketing move to leverage the studios investment in Harry Potter amusement park features. introduce new & younger audience base to the series via streaming TV series. hopefully those scenes left out the movies generate buzz from the older fan set to increase overall interest.
HBO's Harry Potter series is set to retell the books, but many Reddit users are asking whether that is even necessary. The community sees the remake as commercially logical, but questions its creative value. The deciding factor could be whether HBO makes meaningful use of scenes from the books that were left out of the films.