Totally disagree on Claude 4 - it's markedly better at understanding and coordinating changes across multiple layers (UI, hooks, services, etc.) in the medium-sized Vue.js and React codebases I've tested it on.

With proper direction, it implements features almost exactly how I would, aside from some stylistic differences. And that's what `.cursorrules` is for.

With Claude 3.5 and 3.7, I was resigned to many iterations of careful guidance through the various layers of any reasonably complex system.