> And the common justification isn't politics! The most common justification is that there are a lot of "unknown unknowns". They're mostly not unkown unknowns.

> And the common justification isn't politics! The most common justification is that there are a lot of "unknown unknowns". They're mostly not unkown unknowns. They're mostly arcane knowledge of some sort or the other. And what prevents good communication of this knowledge besides either lack of competence or politics? Someone didn't know or didn't care to do better and nobody held them accountantable for it. In particular, the strange horrible code might be there for a great reason. But there is not a good reason for nobody to take five minutes to write a comment about why. And there is no reason to not ask for that comment when the change is reviewed.