Brijesh Deb's third "comfortable lie" of software testing is that AI is now doing the testing: coverage dashboards hit 80%+, regression suites maintain themselves, and leadership concludes that risk is handled, while the experienced testers who knew the domain quietly get redeployed or made redundant.
His core distinction is that AI predicts from what already exists (code, docs, historical tests) but cannot exercise testing judgement, which lives in the gap between what is documented and what real users actually do, including the undocumented business rules nobody thought to write down.
He illustrates this with a fintech case where AI-generated tests covered every documented requirement perfectly, then a regional payment failure surfaced from a sequencing rule held only as tacit knowledge by two ops people, and argues AI works well only as an amplifier of human judgement, not a replacement for the person whose job is to ask whether the green dashboard is covering the right things.
