> Still, I think the effect is almost the same, isn't it?

Nope, it's completely different.
Interpolating normals, you can get highlights in the middle of a triangle.
Gourond-Shading the same triangle would give a dull, dark triangle.
Highlights can hardly be rendered with gourond shading. (only with many
small triangles, so the highlight is close enough to one of the vertices)
Also, gourond shading doesn't combine good with reflection/refraction etc.
I don't think anyone ever used gourond-shading in a raytracer, since it
doesn't make much sense...

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