> You know what’s way more important than short functions and programming platitudes like DRY? Understanding the business, system architecture, and how to deliver fast in the context of what’s already built.

Short functions and DRY are a near universal component of fast delivery, but they are part of the set of practices that mostly enables faster delivery in the increments after the one they are applied in (though I've certainly had single sprints where my delivery time was better because I implemented a reusable abstraction early one that was used repeatedly in that task) so people focussed on fast delivery (as almost all are) who lack more than a myopic perspective tend to overlook them which has a compounding effect.

So, yes, your long lost of things (of which they are a part) matters more together than they do alone, though I'd say that your list is broad platitudes that almost no one forgets are necessary in the abstract, but where concrete details of the last—including fairly context-independent ones like DRY and short functions, as well as more context-dependent ones—frequently do get overlooked, especially when the return is not mainly immediate.