Is there any evidence to show which mindset reflects the real state of things? I.e., I'm not asking whether believing in growth or fixed mindset is more *beneficial,* but which is more *justified.* I think of intelligence as a range that varies from person to person: you probably won't exceed your personal upper limit, but you can also never tell for sure whether you've reached it.

If I'm right, then "growth mindset" is appropriate when you're trying to assess or work within the upper reaches of what you can do, but "fixed mindset" is also appropriate because it doesn't imply that everyone's range is equally broad. There's no reason to choose between them because they aren't mutually exclusive.