Feature toggles are useful for which activity?

According to the SAFe DevOps Practitioner 6.0 study guide1, feature toggles are useful for decoupling deployment from release. Feature toggles are a technique that allows code to be turned “on” or “off” without needing additional deployment. Feature toggles enable teams to experiment with different features, validate their assumptions, and learn from their failures without affecting the rest of the system. Feature toggles also help teams to reduce the risk of deploying faulty or incomplete code, as well as to optimize the performance and resource consumption of the system. Therefore, feature toggles are useful for decoupling deployment from release, which is an aspect of the Continuous Delivery Pipeline that releases new functionality immediately or incrementally based on business and customer needs2.