A popular concept in understanding your product experience is "eating your own dogfood" (or "drinking your own champagne," or any number of other food-or-drink metaphors). But are you really using it the way your users will?
The objects we can grasp in the real world can become a reference point for describing a number of things: a comparison, a structure, a volume, an interaction. Does that world ring true for your users?
Personas are stand-ins for real people – abstractions that can be as specific or general as you need them to be. That kind of abstraction may seem unnecessary, but I've have come to realize that they are extremely useful for a particular type of project.