The more I learn about the SVG spec, the more I understand the rationale of some of the UI decisions inkscape made, and the more impressed I am by how they implemented advanced techniques like shape union and intersection, clipping and masking.
From the little I know about SVG, I wish there was an open source alternative to Inkscape that didn't support standard SVG but used a proprietary format instead. Almost everything you need to create vector art, SVG doesn't support. Multiple outlines in a single shape? No. Varying thickness in an outline? No. Rounded corners on arbitrary vertices? No. Non-destructive boolean operations? No. I'm not even sure SVG suppo…
So you are asking for an authoring tool that has a format that can do what SVG can't and then show examples of how Inkscape can do that? What exactly are you missing then? Is the problem that Inkscape SVG has SVG in the name?