[not a teacher] It's complicated isn't it? I was definitely a "you're just not good at sports/spelling etc" generation kid, and I don't want that for mine because I know learning is not linear and I became much more academic and much fitter as I got older. If I was a different kid I might not have bothered?
But growth mindset lead to my kid that's poor at spelling and times tables being made to do spelling bees with 100 words and full 144 answer times tables grids on a weekly basis and being told she just had to practice more and keep trying.
We moved schools and it turns out she has a processing problem so that approach was completely inappropriate.
It felt like growth mindest was being used as an excuse not to differentiate properly or to do the SEN testing that was needed.