There are more factors that are not easily accessible for both ends of the spectrum, like access to good, personalized education, amount of trauma, and proper psychological support. But the 'discipline' part is what affected me most.
On the other side, maybe those who are more disciplined become real prodigies, and burn brightly because of the lack of social knowledge on how to support them and help to become highly developed adults.
Tons of former gifted kids on here. The gap between assumed potential and actual reality apparently has to get blamed on someone, and that person is the kid themselves.
FWIW I do it too.