Fusion 360 version from March 2016 had no hatch in the section analysis - see below
The same part above since ~9/2016 : always with hatching .
Since there is no way to turn this off - I propose a new preferences option to turn this off. While hatch is useful ion 2D, I think this isn't really necessary in 3D. For me the color scheme is enough to clearly see that this is a section analysis.
Thanks - Stephan