Not all of the EU was good, not at all. I do think Dark Empire and Legacy series were better sequels . Not perfect, but more fun, creative and visionary.
Sadly by the time they started making the ST, even George, these actors were much older and years had to have went by even in the Star Wars fictional universe . You cannot really do direct sequels like Dark Empire or Heir to the Empire unless you recast or move the events 35 years ahead or whatever like TFA/TROS did. The characters are also well past their so-called primes and much of their lives have been lived .
I don’t think Disney/Lucasfilm handled the ST well, they got a lot more wrong than right. I think the “trilogy” format was a mistake too and hindered them as an added disadvantage. They should’ve told the story over the course of 6 films like Harry Potter or something. Them shitting completely on Luke was uncalled for and just out’ve left field. Han Solo going out like he did was fine, since just about everyone knew how Ford felt about the character and Star Wars. Carrie killed herself with drugs, I never understood why they treated her and her character as a saint. I know Leia is much loved to an extent but a Luke she was not, and never was.
With time travel of sorts available in the Star Wars universe, anything is possible. But Disney/Lucasfilm tends to double down on the stupid rather than learning as long as some of the bad apples run the ship.