Kent Beck argues that software development is bipedal — code and trust must advance together. Drawing on Extreme Programming (XP) practices, principles, and values, he shows how each XP element (automated testing, pairing, continuous integration, observability, etc.) simultaneously builds trust and encourages trustworthy behavior. He then contrasts this with AI-assisted 'vibe coding,' which accelerates feature output while eroding trust through prompt-satisfying but unreliable code, single-player workflows, and neglect of long-term structure. The prescription is deliberate slowdown: ensuring code actually works, improving structure, maintaining human interaction, and reinforcing long-term purpose — because trust compounds and enables faster, more sustainable development.
