Default for Automatic Exterior Dimensions

[RootFarm]

I just bought Pro and having been going through the tutorials. I had not noticed that the exterior automatic dimensions go to the outside surface of the exterior sheathing, as this post indicates, but they do indeed.

On Pro at least, this can be changed by going to Edit/Default Settings/Dimension Defaults/Locate Objects/Walls and clicking on Main Layer Surfaces. The automatic exterior dimensions now reference the outer edge of the framing.

When I did this on the plan that I am working with, the rather odd (I thought) dimensions that the tutorial requires you to enter in order to locate one of the windows (2'-7 3/8") immediately changed to something that made framing sense (2'-6").

If anyone knows a reason that it is preferable to design using the sheathing-included exterior dimensions instead of the framing exterior dimensions, I would love to know.