Here is the way I look at it. If one is capable of holding the entire conceptual abstract ephemera relating to the concrete problem you are solving, then WYSIW

Here is the way I look at it. If one is capable of holding the entire conceptual abstract ephemera relating to the concrete problem you are solving, then WYSIWYG is mentally jarring as it often takes away from proper semantic representations of concepts. Indeed very often WYSIWYG attempts to hide semantic meaning from users in an attempt to make it seem easier. Of course for the simpler case this is true. But for complex cases where structure and uniformity and restructuring are important use cases then WYSIWYG is destructive compared with a much simpler markup. I'd also argue with little evidence that there is something mentally jarring for the competent about self expression when having to await moving your arm to do something with a mouse in the midst of the flow of editing.