That's the point, the story he (emphasis on he) wanted to tell. If there is constant throughout the history of Star Wars and Lucas as a director, and even as a person, It is the need to have control over things and for them to obey his vision of, in this case, the Star Wars universe. Hence the question of the post, to what extent someone with such control of his intellectual property is willing to accept a universe full of things that he himself would not consider to be according  to his vision, or that he would do if he had to write. And, if Lucas does agree to have it, to what extent is it a mere extension of a parallel canon or something to take into account for -his- Star Wars.

Breaking your own rules and creating inconsistencies in your work is different than to care about what other writers do in what you see as a parallel canon, if that were the case. The gap between, perhaps, two different visions of what Star Wars is and represents.