As we've discussed deploying the Growth features to English Wikipedia, @Sage_Wiki_Ed points out that it will be confusing for programs like Wiki Education for only some users in a given cohort to have Growth features. He anticipates lots of distracting questions about the features to instructors.
Here on wiki, we discussed the need to smooth this out -- either by enabling or disabling the Growth features for all users that are part of some kind of cohort. The purpose of this task is to come up with ideas and scope out ways to do this. Importantly, we wouldn't want to make the change in the minutes/hours after account creation, because then the confusion will already have been wrought. We want the accounts to be created with the appropriate preferences already in place.