Dan Luu argues that engineers stop seeing the bugs they have learned to work around

Sources: primary
Summary: Luu's claim is that developers who use their own product every day stop perceiving its defects, because they have already built unconscious habits around them, so dogfooding fails at exactly the point it is relied on. The essay argues this through named cases rather than through the general claim alone. One of those cases is attributed rather than asserted here: Luu states that Discourse carried code that slowed real page loads in order to improve web performance metrics, and that rests on his own earlier post rather than on a Discourse source. The site dates the essay to August 2026 without a day.
Why it matters: The failure mode Luu names sits inside the practice teams most often cite as their bug-detection safety net.