Gemini 4 Changed How Google Builds Products | Jaclyn Konzelmann
Peter Yang with Jaclyn Konzelmann · 1 November 2026
Read the originalJaclyn Konzelmann, a product director at Google Labs, expects product managers to write their own documents and defend every statement, because writing is how they think.
Peter Yang, who writes the newsletter Behind the Craft, interviewed Jaclyn Konzelmann, a product director at Google Labs, Google's group for experimental AI products. They discussed how the Gemini 4 AI model changed Konzelmann's product job and how the team keeps careless AI-written text out of its documents and products. The full episode is for paying subscribers, and the open page lists the topics and two takeaways.
- Konzelmann says a document should not take longer to read than it took to write.
- Konzelmann sees handing the writing to AI as a mistake, because writing is thinking, and expects product managers to defend every statement themselves.
- AI can act as a thought partner, but the product manager stays in charge of the argument.
- With code cheap to produce, Konzelmann argues that the main question is whether a product should exist at all.
A product team can hold the author of every planning document answerable for each statement in it, whatever tools helped draft it. Only the open part of the page was read.
Expect each product manager to defend every statement in their own documents, using AI as a thought partner rather than the writer.
Before engineers start building a new product, have the product manager decide whether the product should exist at all, and stop the work if the answer is no.
Derived by Working Surface from the article; more in the Playbook. Source line: It shouldn’t take someone longer to read your doc than it took for you to write it.
2 November 2026: as AI tools speed up design, engineering and writing, teams name a person who must be able to explain and defend the result, because the tools' own reports and specifications cannot stand in for that person.