By dining, I'm thinking of more than just eating. While dining may occur at home or in the restaurant, it has to occur as an activity unto itself. In my opinion, grabbing a sandwich for lunch is not, except in the most unusual circumstances, is not dining. Then again, I see plenty of people in restaurants like Per Se and Alain Ducasse who seem not to be dining either.
Here, "dining" seems a version of eating that is elevated from the mundane and prosaic, a particular kind of experience. How would you qualify that experience? Might that experience change in the future in some fundamental ways?