Problem #1/100: Why your "clean" codebase still takes two weeks to change one thing

You've refactored the fat controllers. You moved logic into services. Your classes have single responsibilities, your methods are short, you use enums and value objects. The code looks clean. And yet — every time the product owner asks to change how failed actions are retried, your team touches twelve files. Every time you swap an external provider, the estimate is two weeks. Every time someone asks "can we add logging here?", the answer involves a pull request across six services. The codebase