YAGNI Was Never About Saving Effort — It's About Keeping Options Open
By
Kent Beck
Summary
This article reexamines the YAGNI ("You Aren't Gonna Need It") principle from Extreme Programming, arguing that its true purpose has been widely misunderstood. The author recounts a personal story where Chet Hendrickson wanted to build a more complex solution preemptively, and the author insisted on YAGNI — not to avoid effort, but to preserve the ability to learn and adapt. The core argument is that YAGNI is about keeping options open and enabling emergent design based on real feedback, not about laziness or minimizing work. The author contrasts this with the modern era of cheap AI generation, noting that even if code generation is free, the cost of carrying unused complexity (cognitive load, maintenance burden, reduced adaptability) remains high. YAGNI is framed as a principle of learning and flexibility, not cost savings.
Source
Hacker NewsYAGNI Was Never About Saving Effort — It's About Keeping Options Opennewsletter.kentbeck.comKey quotes
· 5 pulled"You aren't going to need it."
"YAGNI is not an excuse to never think about the future."
"The cost YAGNI was never about was the cost of writing code."
"YAGNI is about learning. It's about keeping your options open."
"Even if generation is free, carrying unused complexity still costs you."
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