Feature flag is inevitable for all large software projects. 1. To hide not-yet-ready features that have production dependencies. 2. To route special users to

Feature flag is inevitable for all large software projects. 1. To hide not-yet-ready features that have production dependencies. 2. To route special users to a different code path. 3. To test new ML code on a fraction of users. 4. After a refactor to a different language or a micro service, you may need feature flag to route requests. I could go on and on, it's simply mandatory.