Sure, it's valuable. But deeply? If the person wrote the code in such a way that no one else could understand that it was a breath-first search, is that valuab

Sure, it's valuable. But deeply? If the person wrote the code in such a way that no one else could understand that it was a breath-first search, is that valuable? If they didn't even leave comments when they write code? If they didn't realise that you're using some slightly arcane feature of your language to keep a library of useful tree operations, and was expected to use the pre-existing function through macros/generics? Or was expected never to use such a technique because half the team wouldn't understand the code? Hey, I know the theory on how to bake a large amount of cakes, breads, cookies, etc. I learned it by watching it on TV, and from cookery books. But actually it turns out that I'm a pretty crap baker, because I lack experience to know when I'm over-working/under-working dough, how to adjust cooking time with an unknown oven, etc. And I make a huge mess when I'm doing this, and take a lot longer than anyone with basically any experience of doing it at all.