As a developer with apps in the MAS, this sounds like a sales, maintenance, and support nightmare. How would you architect your app to have separate, modular f

As a developer with apps in the MAS, this sounds like a sales, maintenance, and support nightmare. How would you architect your app to have separate, modular features? How would I reliably test all combinations of all features? How do I properly advertise app functionality without deceiving users? How do I properly support users when they have issues? (Depending on what they've purchased, they could have a very unique set of features and UI enabled.) You're taking a hammer and using it to tighten a screw. Instead, Apple should be offering the proper tools we need to offer reasonable app upgrade paths.