[lpah4all]

>> I don't know what exactly contributes to this

Proper mental models, tool mastery, love for hyperfocus, brutality of testing, passion for solving interesting, difficult problems, along with the proper work environment involving a proper problem.

The same could be said for Andrew Wiles' process of solving Fermat's Last Theorem, tho in a vastly different arena.

If I had to nail it down to a single characteristic, it would be obsessive tenacity in the pursuit of a high standard of craftsmanship. From that, all else comes with time.