Why does Dotvault say a variable is missing?

That banner has nothing to do with your .env.example. It comes from the frameworks and packages Dotvault detected in your project: each one has a set of variables it needs, and the banner lists the ones your file doesn’t have yet. Every chip names the framework or package that expects it, and clicking one adds it to the top of the file.

It only flags variables your app genuinely won’t start without — a Laravel APP_KEY, a WordPress database name, a database URL. Keys for optional services you may not have signed up for are left alone: Dotvault still describes them in the editor and offers them as suggestions, but it won’t nag you about a Flare key or a Stripe secret you were never going to set.