Well said. I would add to this that design patterns do not discern between simple concerns and cross-cutting concerns and those are key elements to get right at

Well said. I would add to this that design patterns do not discern between simple concerns and cross-cutting concerns and those are key elements to get right at the organizational level. Features are by definition almost always cross-cutting concerns in that they touch half the systems that makes up the application. Even if your systems are pure isolated islands properly decoupled from each other, they can still be tangled back into a spaghetti mess when wiring it all together. Furthermore, design patterns define data structures rather than data flow, even the behavioral ones, making them horrible at organizing the application's features.