To create a good ending is really a difficult task. The end of the film is remembered only when everything seen by the viewer earlier leads to a grandiose finale. How often do you feel a slight disappointment from the completion of the picture? How many finals simply do not stay in memory? I think that's enough.
Damien Chazelle is one of the few masters who know how to finish their work. If you watched "Obsession" and "La La Land", then for sure you understand what I mean.
In general, look good video on the topic, better I would not be able to say: