Okay, it may only take a second to edit out some fluff at the beginning of a video, but not having to do that, and more importantly, being able to get into position first, then set recording later takes the "go go go, we're filming" pressure off.
Journalists get the training and practice to be able to do this speedily every day, but it's perhaps not too difficult to learn, and allowing other people to edit and improve your work can help overcome sloppy writing or typos.