I can't agree with that as Lucas was, by all accounts, in support of the Legends. Sure he would have gone ahead with this Reboot but when he was making the Prequels he didn't stop other writers from continuing their own work as this part of Star Wars History was pretty much unexplored. And @Mecha82 as for any instance of Lucas not caring about Legends I don't think that's the case at all. Speaking from experience in regards to the DC Animated Universe I'm working on, it IS in a different continuity from the Original DCAU but that is mostly down to elements from that series not lining up where I want to take my stories.
Case in point, I LOVE Batman Beyond but I don't want to include it as it doesn't line up with the stories about Batman I want to tell. Wonder Woman's origin story of how she became a superhero and came into the world of man is based on her 2017 movie and her character has more in common with her Worlds of DC counterpart.
I'm not telling a different story because I dislike anything from the DCAU I'm telling a new story in a new continuity because that's the story I want to tell. I've seen every DCAU episode and I'm looking forward to Justice League vs. The Fatal Five. But the stories I want to tell cannot work with the stories of the original DCAU and it's likely that Lucas felt the same way about the Legends as he Was a fan of a number of those stories, with ones like Dark Empire, he had likely read The Thrawn Trilogy due to the thematic similarities and according to some sources he was very adamant about the writers of the Clone Wars reading up on the Clone Wars Comics to get ideas from said comics.
I am 99.99% certain that had Lucas gone ahead with his Sequel Trilogy he likely Wouldn't have outright cancelled the Original EU as he knew a lot of people put a lot of effort into it and would have kept it going even with Legacy of the Force's tarnishing the EU's name. Say what you will about Lucas but he was very much on board with the EU as a place for writers to flourish with their ideas, even if he didn't consider it his canon.
Disney on the other hand, cancelled the entire EU ending a number of series prematurely, cancelled The Clone Wars despite having good ratings, and tried to ignore any and all references to the Legends series until recently. I know Lucas has flaws as a writer but I can't agree that he didn't care about Legends or didn't respect it as all we have seems to suggest that he Did respect it and even liked it. ¯\_(ツ)_/¯