Marty Cagan revisits 20 years: 10 product management beliefs he no longer holds
rseroter · x · 2026-09-15
Silicon Valley Product Group's Marty Cagan published "Strong Opinions, Loosely Held", based on his Lenny & Friends Summit keynote, answering: "what did you used to argue was true that you no longer believe?"
- Using the 2008 first edition of INSPIRED as his baseline, he details ten major changes in his thinking since then — the things he wishes he'd understood earlier.
- He focuses on underlying principles rather than frameworks, but argues AI's transformative nature makes it fair to question even his most sacred principles.
- He treats his content as a product, running weekly product discovery on it.
- The first disclosed shift concerns Business Viability, with ten areas covered in full.
A must-read long-form for PMs navigating the AI era.
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