I've done this. We have a customer whom we bill for feature X. Does he actually have feature X or are we billing him for nothing? With ES: We see his Subscri

I've done this. We have a customer whom we bill for feature X. Does he actually have feature X or are we billing him for nothing? With ES: We see his Subscriptions and Cancellations and know if he has feature X. Without ES: We don't know if he subscribed or cancelled. With audit log: We almost know whether he subscribed or cancelled.