If a user can't see the feature, it doesn't exist. Typically enabling a feature means revealing it at the view layer, which is quite simple. Any DB schema chang

If a user can't see the feature, it doesn't exist. Typically enabling a feature means revealing it at the view layer, which is quite simple. Any DB schema change can take place ahead of time. As for the complexity of testing permutations of features - that sounds like a problem with your Q&A process, no matter how you implement it.