> this is why your carefully crafted structure will break down -- it has no basis in reality. This is spot on. And also, DRY is for concepts and abstractions,

> this is why your carefully crafted structure will break down -- it has no basis in reality. This is spot on. And also, DRY is for concepts and abstractions, not just duplicated lines of code. Picking the wrong abstractions often has a much higher cost down the line than some duplicated code.