The Osinski principle

Osinski Principle noun
1. You are not finished your project; done is your relationship to the project. It is just a new release.
2. A concept asserting that the completion of a project is not a final endpoint, but rather a transition to a new phase; the project remains an ongoing endeavor with continuous improvements and updates.

Example in context: "According to the Osinski Principle, releasing a version of the app doesn’t mean the work is done; it’s simply the beginning of the next iteration."