While Gfast updates won't actually help your dietary needs, they do push the service offerings into alignment with those of a fiber-only connection. From a service provider view, this simplifies operational processes, since providers need only maintain a single set of service profiles for their customers to purchase.
Put another way, it wouldn't matter if a customer has a fiber only connection or a fiber connection extended by a Gfast connection: The user experience is the same.
That's...