This is because images are often considered more truthful than text, which obviously requires interpretation. An image is expected to speak for itself. Text becomes only another visual design element, no more nor less important than any other. Internal human states can only be communicated by their physical manifestation. Strong moods and emotions that read clearly work best for imagery.
Good imagery is expensive to create and maintain.
The control of the content will be in the hands of those with enough financial backing to produce it. The Promises of Visual Culture Visual culture promises that it's good news. We are told that images need no interpretation, and any bias they might have is obvious. Visuals are honest, objective, and true. And because they can be so easily decontextualized, they are unifying.