Simultaneous Preview is bad

Simultaneous Preview is bad. First, it constantly changes the screen spacing, which pulls your eye away as you see something moving. For example, when you are trying to reply to something, the text below it is constantly moving up and down, creating a distraction. It also makes it hard if you are trying to look at the old post while replying (something that the variable location of the entry box is good for), as the rest of the screen moves around without your control.

Further, when you go to edit, you're going to gravitate toward the preview because it looks like what you read on the rest of the site, only to go "dammit, I can't actually click there'. This is a noted problem on stack overflow, with people continually wanting to edit code in the area where it looks normal.

Either we need to have the edit box be WYSIWYG or we need to just not have the preview up at the same time as the editable box (make it toggleable). Either way, we need to give control of the page spacings to the user, so things are not constantly changing sizes (BTW the edit box needs a size drag in any case, so you can control how much you scroll).