I don’t like that Luke literally had no surviving followers left. Kylo Ren seemed too inept to have wiped them out. Maybe if we’d have seen some of his final followers being murdered, or perhaps destroyed by Starkiller base. Something to indicate that Kylo wasn’t all that was left. Or perhaps the place with all the sith could’ve been filled with former followers turned evil. It just seemed like such an empty universe, and that’s always been my problem with the main saga.