I SO agree with this
I do understand Disney's decision, though. On paper, it was far better to try and surprise the fans with something fresh they hadn't read nor heard about anywhere. New characters, original storyline, etc... The Expanded Universe is a bit too massive and constraining, creatively speaking, at times. That's how I approach my Star Wars RPG games: I take no account of any Star Wars continuity and storyline, but I try to make my own, with respect for the universe of course.
HOWEVER, at the very least they could have looked to them as a source of inspiration. Those were quality books, contrary to the massive turds the new films have been.
The one problem I see with the Vong invasion is that it is a bit too "generic". It makes SW look like Warhammer 40k, all of a sudden. Don't get me wrong, I love the Vong; as a kid, I did feel a deep connection with this species of proud warriors with a sadistic bend. But, it departed from the very human-centric approach Star Wars originally had, in my own humble opinion, and on the big screen I think it would just become a mad dash to "destroy the evil race".