If you need to find your latent/pre-determined passion, that ultimately means you don't really have a choice of what you do with your life. You just need to find what was already chosen for you.
Conversely, the growth-mindset restores choice to your life. You can choose what to be interested in, instead of limiting yourself to what you're already interested in. That's very powerful and self-affirming, and actually has a lot in common with the philosophy of existentialism, which is about making your own meaning. [1]