Another use case could be to make it easier/ automatic to create comics. You tell what the background should be, characters should be doing and the dialogues. Boom, you have a good enough comic.

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Reading as a medium has not evolved with technology. Creating the imagery does happen in humans' minds. It's not surprise that some people enjoy doing that (and also enjoy watching that imagery) and others do not.

This could be a helping brain to create those imageries.

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Now imagine, reading stories to your child. Actually, creating stories for your child. Where they are the characters in the stories. Having a visual element to it is definetly going to be a premium experience.