Having them show up in exactly the same setting so that it feels like an outtake from the preceding film is a bit like recycling, smartass.

ROTJ recycled Tatooine, a cantina scene (Jabba's palace) the Death Star and the dogfight from Star Wars. It also recycled Yoda and Dagobah, the Luke/Vader duel and the familial reveal from EBS. Pretty much the only thing it did bring to the table is the Emperor, the Ewoks and the shitty forest battle.

You could say the same of "Return of the Jedi".TFA managed to do the same re-run thing whilst being massively entertaining and introducing engaging new characters.