Despite all the past rhetoric about the EU being on some kind of "canon level" or whatever, the fact is that it's just like any other tie-in material to any other franchise -- it's a supplement to the real thing, and the makers of the real thing are free to draw on its ideas or disregard them as they see fit. So some parts may be acknowledged and embraced if
they serve the purposes of the creators of new canon, while other parts will be ignored or discarded if they get in the way.
For that matter, canon itself is subject to being reinterpreted or ignored, which is why it's such a mistake to confuse "canon" with "continuity." The prequel trilogy contains a lot of things that are difficult to reconcile with the original trilogy, as many SW fans probably know better than I do.