People in fandom crave too much an unnecessary angst post-canon CQL that doesn't really reflect the true positive potential of the ending, but here my idea: LWJ hasn't at all the qualities that make him a good Chief Cultivator, from the sect's povs. The conferences are super awkward, Hanguang-Jun is not all accommodating like the Jins and makes the sect leader Yao spend many terrible and hard hours! But the worst? Hanguang-Jun dares to want to form a more open minded cultivation society, the unorthodox tricks are welcomed and there will be lessons when young students could learn in a totally safe way. Unless they are proven to be dangerous and have bad intentions, outsiders are not longer persecuted. And if someone dares to speak just one bad word on the Yiling Laozu, Hanguang-Jun would totally throw his guan right in his face.
Lan Wangji will really make regret the sect leader's choices and Wei Wuxian, totally fine and safe, will be super smug about it.