That would make sense but Disney probably don’t want to splinter the material and suggest only one part of it is the “real” one and therefore the one to buy into. Which of course is what we have anyway now with the trilogies existing in detached bubbles. George didn’t take enough care and neither did the current studio suits. Other books and comics by their nature will never be taken as part of the proper series whatever they do, that’s just how extra material is viewed in any franchise.