Why do so many people cry for the miracle of la la land?

When I watched la la land, I paid more attention to the story and emotion of the film, and I was moved by the dream and love expressed in it. But frankly, I didn't pay enough attention to it when I watched it, because I was always attracted by some scenes in the film. While marveling at those smooth shots and beautiful pictures, I can't help wondering: how was this paragraph shot? How does the camera move? What about the lights? How did the director arrange this scene? Questions like this drew my thoughts behind the screen. Even though I was moved by many details in front of the screen, I still couldn't stop thinking about shooting. For example, if I have to face this script, I may think about similar questions: how to present the real highway congestion without computer special effects? How to arrange 100 dancers to complete their own songs and dances and achieve a certain unity? How to solve the color of the actor's clothes and body, so as to make the picture look good and the atmosphere warm enough? How to arrange, in order to finally complete a sense of fluency? How to make the camera move freely in such a crowded, crowded and narrow space? It's hard to think. First of all, to solve the venue problem, you need to find a real and safe highway that allows you to shoot for a day or two (which means you need to close the road). This requires not only finding such a scenario, but also completing a series of approvals.