Picking up on the "invisible art" idea, and skirting around whether the art should or should not be visible in the storytelling, I think there's a general "new language" problem. Using photographs was once a new language in comics, and until people understand the language the results can be like reading a poem written by somebody learning a new language. Look at the examples in that article. The face in the "Kingdom Come" panel is an idiom slipping through from another language. Telling a story in still pictures isn't like a movie, and it doesn't matter if the pictures are drawings, photographs, or 3D renders. But they're distinct dialects, perhaps related, and perhaps akin to a pidgin or a creole or some other evolving mix of older tongues. After all, isn't the composition of a picture; the alignment of eyes and lines in the scene, a language which tells us where to look, creating a sequence in a single image.