durability of inferred knowledge

Think of DNA and reimplementation. Question: how often on average are things reimplemented in DNA? Program durability is one thing, but

existing code is capable of solving the problem AND existing code is used to solve the problem

Edit distance efficiency, tentatively

Is quite another. I'd be interested to see

Also, reading the deductive uncertainty paper would really help right about now, since it hooks up real nice.

(Above notes sparked from Samo Burja, Functional Institutions are the Exception. Civilization: Institutions, Knowledge and the Future - Samo Burja - YouTube)