It depends heavily on the scope and type of problem. If you're putting together a standard isolated TypeScript app from scratch it can do wonders, but many large systems are spread between multiple services, use abstractions unique to the project, and are generally dealing with far stricter requirements. I couldn't depend on Claude to do some of the stuff I'd really want, like refactor the shared code between six massive files without breaking tests. The space I can still have it work productively in is still fairly limited.