At Statsig, the process of measuring the cumulative impact of multiple feature launches is enhanced through the use of "Holdouts," a method inspired by practices at Facebook. Holdouts involve withholding a small percentage of users from experiencing new features for a set period, providing a baseline to assess the collective effects of these features over time. This method is particularly useful for evaluating long-term impacts, detecting subtle changes, and analyzing metric shifts. Statsig offers a user-friendly setup for implementing holdouts, with features like automatic impact computation via the Pulse engine, and options for global application or back-testing existing features. The platform also supports a free plan to encourage experimentation without sales intermediaries. Additionally, the text discusses the significance of CUPED for running efficient experiments, insights from industry experts on fostering an experimentation culture, and reflections on transformative experiences at companies like Optimizely and Facebook, highlighting Statsig's unique culture and dedication to innovation in A/B testing.