The Four Fits and PMF misconceptions

Brian introduces misconceptions about product-market fit and why it's not binary or permanent.

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Brian Balfour, Founder & CEO of Reforge and former VP of Growth at HubSpot, joins Mostly Growth to explore why product-market fit is a moving target. He introduces the concept of the Product-Market Fit Treadmill, a state where rising customer expectations and competitive pressure make it harder than ever to stay ahead. Brian breaks down how AI has accelerated PMF collapse, explains the hidden costs of product adoption, and shares how Reforge shipped five AI-native products with a team of just 20 people. Packed with frameworks, strategic insight, and startup realism, this episode is essential listening for product leaders, operators, and founders navigating the next wave of GTM.

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LINKS:

Mostly Metrics: https://www.mostlymetrics.com

CJ on LinkedIn: https://www.linkedin.com/in/cj-gustafson-13140948/

Growth Unhinged: https://www.growthunhinged.com/

Kyle on LinkedIn: https://www.linkedin.com/in/kyle-poyar/

Brian Balfour: brianbalfour.com

Brian on LinkedIn: https://www.linkedin.com/in/bbalfour/

Slacker Stuff: https://www.slackerstuff.com/

Ben on LinkedIn: https://www.linkedin.com/in/slackerstuff/

https://brianbalfour.com/four-fits-growth-framework

https://x.com/amasad/status/1981201454032703662?s=46