"Disappointing"
I would not. Hemingway was never a favorite. After "A Moveable Feast," my opinion has not improved. His stories of Paris in the 1920's are quaint and engaging, but humorless and rambling. His variant use of person seems random and, at times, accidental. Unless you are an unreconstructed Hemingway aficionado, look elsewhere.
It was self-centered and pointless.
His performance was flat and lent no energy to the stories.
No. "A Moveable Feast" does not indicate that Hemingway has anything more to say.
I make no claim to literary expertise. This is merely my opinion. I am not unlettered. I have read a good bit of the Western literary canon including Plato, Chaucer, Cervantes, Shakespeare, Dante, Dickens, Hobbes,Tolstoy, Marx, Engels, Ibsen, Freud, Kafka, Goethe, Joyce, Lawrence, Elliot, Fitzgerald, Thomas, Neruda, Dickinson, Sartre, O'Neill, Beckett, and Ionesco. I am not a fan of Gertrude Stein. Perhaps that history will give you a perspective on my bias with respect to this work.