Right now running mongod with all feature flags is a bit kafkaesque. First you need to run some script to extract the list of every feature flag to a file. Then that file is post-processed to either generate a config file or a massive list of --setParameter=featureFlagFoo=true arguments to pass to the server. That isn't really friendly for a human to run. Ideally the server could just take a single flag like --allFeatureFlags. This would simplify locally reproducing failures that only happen in our all-feature-flags variants.