Lean, not backpressure
The author takes issue with Lucas Costa's framing of a key concept as "backpressure," arguing that the more fitting metaphor is lean manufacturing. Where backpressure signals upstream processes to slow down, Costa's actual suggestions are about getting upstream to do things differently — prioritizing quality over quantity.
kqr writes that "lean" has two halves: the famous waste-reduction side, and the less celebrated side about "managing the unstable input of people." The latter is what matters here.
Three Lean Practices Highlighted
- Single-piece flow — working on one item at a time so downstream can reject defective work before too much accumulates.
- Autonomation (jidoka) — equipping machines to detect problems and halt on their own.
- Poka-yoke — designing processes that make correct results inevitable by construction.
The Robot Angle
The author observes that managers who blame human workers for quality failures suddenly find that logic breaks down with AI coding tools. "It's a robot! It can't be responsible for its actions." This forces a reckoning: processes must be designed to tolerate imperfect output rather than demanding perfection from the worker — whether human or machine.
kqr quotes Deming's insight that "a bad system will beat a good person every time," and adds a favorite safety principle: if your system "requires humans to not make mistakes, then whose fault is this really?"
Bottom Line
The piece argues that the shift to AI-assisted work makes obvious what was always true: the system, not the individual worker, bears responsibility for quality. "We always had to do that, even with people, but with robots it's painfully obvious."