"the greatest teacher failure is"
Demonstrably false and wrong.
https://www.weforum.org/agenda/2019/11/success-failures-lear...
I don't believe that study has any relevance to the world of creative work -- like building products or becoming a Jedi ;) -- that is driven by intrinsic motivation to iterate and improve. Success rarely requires the same level of self-evaluation and reflection in creative contexts.