Promotional videos are expensive to produce.  Content  needs to be generic in order to have maximum appeal to the widest audience.  The video can quickly become dated, with a single redundant scene requiring a costly re-make of the whole film.  

And a prospect has to watch the entire thing, from start to finish, even though much of the material may not be of interest directly. 

The Ambidext solution is more flexible, more specific, more manageable and more cost effective.