When
A real-world example of Frequency illusion in action
Context
A mid-size B2B SaaS company had a product roadmap focused on reliability and security upgrades after a recent spike in enterprise customers. The product team was preparing a major security hardening sprint scheduled for the next quarter.
Situation
During a strategy meeting, a product manager noticed a social post about a competitor rolling out a polished dark mode and then started seeing multiple mentions of dark mode across industry Slack channels and Twitter. The team interpreted the sudden visibility as an emerging must-have and reallocated 40% of the upcoming sprint resources to design and build dark mode before the security work.
The bias in action
After the product manager first paid attention to the competitor's dark mode launch, similar mentions stood out on the team's social feeds and newsletters — a classic frequency illusion: the team believed dark mode prevalence had increased because they began noticing it more. Confirmation bias then reinforced the perception: every later sighting was taken as evidence that the market was moving rapidly. The team did not check historical competitor release data or customer demand metrics; instead they treated the increased salience of the feature as a proxy for rising customer priority.
Outcome
The security sprint was delayed by two months and a known vulnerability remained unpatched during that time. The dark mode feature shipped as a polished interface option but saw modest adoption (12% of active users) and produced negligible improvement in customer satisfaction. Six months after the decision, the company incurred remediation costs and customer losses tied to the delayed security work.
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