I seem to recall that at the time The Force Awakens was released, people were saying that they would have liked to see the old gang together. But thinking of it, in the original trilogy, Luke, Han & Leia aren’t that much together. They don’t have a lot of scenes in common: in ANH: the beginning of the Death Star Escape, the return from the Death Star battle and the Celebration; in ESB: Luke’s recovery (and that’s all?); in ROTJ: the very end of escaping from Jabba, the Mon Mothma briefing, the first part of the Endor mission and briefly in the Ewok Celebration. They’re really on an adventure together only when they escape from the Death Star and during the Endor mission.