The happy ending of ROTJ is only a thing with the OOT. Heir to the Empire is 5 years after Endor and the Rebels still haven’t beaten the Empire. The so called mopping up action lasted years until they officially ended the war with peace with the Empire and the New Republic. A New Republic itself which only lasted until it was replaced by the galactic alliance, and then that same galactic alliance was overthrown by the Sith. At least Luke’s Jedi Order in legends lasted over a hundred years until they were destroyed by the Sith.

The Sith kept returning, never mind the Vong and the second galactic civil war. The Galaxy never was at peace for any long period.

Now all that is now legends.

Disney decided Luke, Han and Leia weren’t all that important and to focus on their own characters. To pass the torch even if they botched it, and Luke, Han, Leia and Lando never shared a scene together. So the new trilogy being about Rey is fine, i mean Luke had his trilogy, and Anakin had his. Why not open the universe to new characters and new adventures. Its a shame they had to remake episodes IV-VI instead of doing something original or fresh.