Reminds me of a line attributed to Bruce Lee:
"I fear not the man who has practiced 10,000 kicks once, but I fear the man who has practiced one kick 10,000 times."
You can see this difference in the the films produced by him and his studio versus the american-produced ones. Every Frame a Painting has a good video on this. [0]
Typically for films the shooting portion takes only a few weeks to finish, so lots of retakes = money lost. Jackie Chan does a lot of random flourishes in his films that end up with him needing a lot of takes. For example, how he scales fences. [1]
The way he scales the castle wall in Wheels on Meals (1984) is probably my favorite example.
>Whatever you do, do the best you can, because the film lives forever. No, "because that day it was raining and the actor don't have time."
>I said, "would you go to every theater and tell the audience?" No! The audience sits in the theater: good movie? Bad movie? That's all.
And he practiced what he preached, sometimes going through hundreds of takes to get a stunt just right.