It exists, but I see those as edge cases. Compared to when someone is asking "am I smart enough", they are really asking if they can move from where they are no

It exists, but I see those as edge cases. Compared to when someone is asking "am I smart enough", they are really asking if they can move from where they are now, to just a bit higher, the answer is usually "yes". At that level, innateness is irrelevant to those who succeed, and a self-fulfilling prophecy (at least in part) for those who don't.