Yeah. Lucas should have just kept what he had and that was it.Maybe if you compare the Legendarium against Star Wars. It's hard to compare three novels to 9 movies, and a multitude of other canon material across different mediums.
But what does hurt SW is that it's having little retcons here and there, and that it is going to get whored out by Disney so that means the suits get the ultimate say.
Once Tolkien died the canon stopped.
I'd more compare LOTR to Dune in its posterity.