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There are a few case studies listed in most of the feature flag solutions, of course, each organization is completely different and the maturity of each organization varies. But feature flags are a 2-way-door decision, meaning that you can adopt them at smaller scale, try it out and see if it works for you before making a decision.

Here's a list of case studies from some of the solutions referred in the comments, some focus on operational metrics, others in lead time to changes: https://www.getunleash.io/case-studies https://launchdarkly.com/case-studies/ https://www.flagsmith.com/case-studies

The LaunchDarkly 2022 State of Feature Management Report has results from surveying 1000 software people and looks at impact on those DevOps metrics: https://launchdarkly.com/state-of-feature-management/

This was written by a company selling feature flag software. Use that information as thou wilt.