No, it says if you have a QA process it doesn't including a staging environment. A QA process is just a process - it doesn't have necessary parts - as long as

No, it says if you have a QA process it doesn't including a staging environment. A QA process is just a process - it doesn't have necessary parts - as long as it's finding the right balance between cost, velocity, and risk for your needs, it's working. Some parts like CI are nearly universal now that they're so cheap; some like feature flags managed in a distributed control plane are expensive; some like staging deployments are somewhere in the middle.