They do move but when you start to "work" on anything, individual things stop for the period of the work since you're not just "looking" at them, your "cursor" is elsewhere. The reply box, etc. can't tell if you're going to edit the coding for the avatar/smilies or something else. "Everything" is in edit mode when you're editing, not in "working" mode (sometimes my explanations are clear as mud, sorry :-)