A Problem with Microblogging

A journalism professor recently wrote with emphatic resistance to microblogging services like Twitter, which are having field-shifting effects on her profession.  At the heart of her piece is the following sentence:

I worry that microblogging cheats my students out of their trump card: a mindful attention to the subject in front of them, so that they can capture its sights and sounds, its smells and tactile qualities, to share with readers.

While I am often tempted to write off positions like the one above as technophobic, there is something more to it.  As  English teachers, I wonder if there isn’t a comparable concern in our field.  To what extent does the quickness of online publishing work against the writer’s careful sense of imagined readers?  That is, does such writing focus too much on the blogger’s own whim and speed as opposed to the needs of those who read it?