Most founders treat an MVP as a smaller version of their final product — trim the feature list, ship what's left, and call it minimal. That framing is where things start to go wrong.
An MVP isn't a smaller product. It's the fastest, cheapest way to test whether your riskiest assumption is actually true.
The Assumption Problem
Every product idea rests on a stack of assumptions — that people have the problem you think they have, that they'd pay to solve it, that your approach is the right one. Most MVPs fail not because the engineering was weak, but because they were built to prove the product could exist, not that it should.
Before a single screen gets designed, it's worth writing down the two or three assumptions that would sink the entire idea if they turned out to be false. Those are the ones the MVP needs to test — everything else can wait.
Scope Is a Strategy Decision, Not an Engineering One
Teams often let scope get decided by what's technically easy to build first, rather than what's most informative to learn first. The result is an MVP that's genuinely minimal, but tests nothing of consequence.
A product-first approach flips this: define what you need to learn, then figure out the smallest, fastest thing that gets you a real answer — even if that means building the 'hard' part first because that's where the actual risk lives.
Launch Is the Start of Validation, Not the Finish Line
The MVPs that succeed treat launch as day one of a feedback loop, not a finish line. They're instrumented to tell the team something, and the team is set up to act on what they learn quickly.
At Nest, this is where we spend the most time with founders before any code gets written — getting clear on what the MVP actually needs to prove, so the build effort goes toward reducing real risk instead of just shipping something.