CleanMyMac vs MegaCleaner: Why Generic Cleaners Miss 80% of Developer Bloat

You're a developer. Your Mac says you have 15GB free. You download CleanMyMac, run a scan, and it proudly offers to clean 4.7GB of system caches and browser data. You clean it. The number barely moves. Meanwhile, you have 40GB of stale node_modules folders, 25GB of Xcode DerivedData, 18GB of Docker images you forgot about, and 8GB of Rust target/ directories scattered across old projects. That's not CleanMyMac's fault. It was never designed to find those things. It's a general-purpose Mac cleane