The Only Thing That Matters

Biological Parallel

In evolutionary biology, fitness is the only metric that matters—everything else is a proxy. An organism can be fast, strong, colorful, or intelligent, but if those traits don't translate to reproductive success in the current environment, they're evolutionary dead ends. Marc Andreessen's insistence on product-market fit mirrors this: revenue, users, and press are interesting, but survival depends solely on whether your offering matches what the environment (market) selects for.