Product-market fit isn't about iterating on your product - it's about identifying an inflection point in technology first, then finding the right market. Most founders get this backwards.
Most founders think product-market fit means tweaking features until customers bite. Andy Rachleff argues they're optimizing the wrong variable. The real work is identifying an inflection point in technology - a fundamental shift that lets you build something genuinely new. When Rachleff built Wealthfront, that inflection point was brokerage APIs and ETFs becoming viable. The product followed from the technology shift, not the other way around.
Once you've nailed the technology inflection point (the "what"), only then should you focus on the market (the "who") and business model (the "how"). This is the opposite of conventional startup wisdom, which tells you to find a market problem first. But that approach leads to consensus thinking and incremental outcomes. Venture-scale returns come from non-consensus bets on technology shifts that most people don't see yet.
The other trap Rachleff sees constantly is mistaking paid growth for product-market fit. Founders fall in love with their CAC numbers and convince themselves they're onto something. Real product-market fit shows up as exponential organic growth - word of mouth that happens because people actually love what you built. If you're not seeing that viral coefficient without ad spend, you haven't found it yet. People only recommend things they genuinely love, and no amount of Facebook ads can fake that signal.
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