I, personally, think about it like a coping mechanism. A way to think of the positive. A way to move past struggles without resentment, fear, or sorrow. That even the things that aren’t perfect are still good enough to serve the purpose they are meant to.
Although I don’t always agree with how it’s used or how often it’s used, I think some people need a bit of more of the “She’ll be right” mentality in their lives.