Advantages of Multimodal Composition

As I read through Mickey Hess's "Composing Multimodal Assignments" I was debating whether I could create multimodal assignments, when I myself have had very few of these assigned to me. As this idea was wandering around my head, I came upon Hess's statement: "And although both teachers and students come to the classroom with prior experience in, and habitual approaches to, composing alphabetic essays, it would be unusual for them to have had similar extensive experience, or developed such sedimented habits, with video and audio composing. Thus, assignments that ask students to compose in multiple modalities can encourage both teachers and students to take creative approaches to making meaning." I then began to wonder, if teachers do have extensive experience, and students do not have habits set in stone, wouldn't teaching composition multimodally be a lot easier than teaching alphabetical composition? I wonder this because if there are no set habits, like there are in alphabetical composition, and no preconceived notions about composition, would it be like learning a new language without any previous knowledge or experience with another one? I ask this because it appears that the longer a person has used one language the harder it is for them to learn a second or third (easier for children to learn multiple languages than it is for adults). I make the comparison between foreign language and multimodal composition because they are both different ways of communicating ideas, so maybe learning trends will be similar. This brings me to my next point, if this is the case, then won't younger people, say college students, learn multimodal composition easier then older people, say tenured faculty? Perhaps multimodal composition will allow for the study of composition to continue and grow in a way previous generations never saw possible.