A customer asked me once, in the middle of a demo, "what is lorem ipsum?" That is the moment. The preview URL loaded. Every page rendered. The merge was clean, the build was green, the tests passed. And a customer I was trying to sell to was reading placeholder copy out loud on a shared screen. I've thought about that moment a lot. Not for the embarrassment, though I earned it. For what it told me about what a preview environment actually is, which is not what most of us think it is.