When done right, comics are a cognitive whetstone, providing two or three or more different but entangled streams of information in a single panel. Processing what you’re being shown, along with what’s being said, along with what you’re being told, in conjunction with the shifting multiple velocities of imaginary time, and the action of the space between panels that Scott McCloud defines as closure...
I have actually tried to do this in prose: Blood & Iron is the result, and as many can testify, using only one input stream for all those entangled information threads results in almost headsplitting density and limited success. (In your average comic panel, the streams may be visual/art/action/scene setting, narration, internalization, dialogue/thought, and white space. Yeah, think about that for a moment, and consider that maybe I missed one. Or two. And that they can contradict or ironicize each other.)
Comics are cool. They are an interstitial art form all in their lonesome.