Indexed vs Non-indexed primitives
Ok, bad example if you draw it with triangles. Take a tetrahedron instead for an example with no shared vertices.
This is one case where the GS stage is genuinely useful; you have access to all of the position data on a per-face basis, so you could use that to generate normals and texcoords for a cube (which tend to be pretty standard) while still keeping the vertex count down.
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