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SVG cannot be entered by humans in the same way this can

I don't agree. SVG is very human-editable indeed. It's easier than even PostScript or OpenGL.

To each his own then I guess. Some may enjoy aligning pipe symbols and pluses, I don't.

I don't either, but I enjoy cutting and pasting back and forth, or keeping diagrams in separate formats, or trying to write SVG manually even less.