I agree that there is no wrong or right in this context. I do however fear that if we are unable to concentrate on media for longer periods of time, the "depth" of the media will diminish. The wonderful thing a book has over a youtube clip is the depth of emotion it can describe.
You engage in a real emotional thought process, following along with the main character, hoping with them, fearing with them. Short media doesn't have that kind of engagement.
Also, creative thinking seems to rely on long thought chains in order to build complete things. Amongst others, self-interrupting every couple minutes is what made my creativity tank over the past years (and my ability to get lost in a book).
You engage in a real emotional thought process, following along with the main character, hoping with them, fearing with them. Short media doesn't have that kind of engagement.