Sure. I know Facebook wouldn't put out videos like that but it seems 80% of all videos linked to do start out like that and that's the quality you're going to get from anyone worth listening to. Even the polished ones, though, blatter on about things I don't care about but I can't skim ahead in the video without worrying I'm skipping something I really do want to hear.
Thus, the advantage of text. To the point. Skimmable, both forward and backward with the ability to understand what you are skipping over.
Have you ever read transcripts from talks given? Don't you wish someone would have edited out all the garbage talk beforehand? And doesn't your mouse wheel finger hurt scrolling down the page, only to be told "to hear the rest of the video, click here".
Now let's talk about the weight of video files ....