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🧱 Build software that lasts. Join the Software Design Mastery waiting list → https://arjan.codes/mastery. In this video, I show how a “clean” DRY refactor can actually make your code worse. Instead of improving the design, it introduces hidden complexity, confusing flags, and harder-to-understand behavior. Then we refactor it again, this time focusing on behavior and responsibilities, not just code shape. 🔥 GitHub Repository: https://git.arjan.codes/2026/dry. 🎓 ArjanCodes Courses: https://www.arjancodes.com/courses. 💬 Join my Discord server: https://discord.arjan.codes. ⌨️ Keyboard I’m using: https://amzn.to/49YM97v. 🔖 Chapters: 0:00 Intro 0:30 The Bad Refactor First 3:58 What This Teaches About DRY 4:48 A Better Refactor 10:24 Some Duplication Is Actually Good 11:21 Quick Guidelines 12:36 Final Thoughts #arjancodes #softwaredesign #python