I think it would be very convenient to be able to assign the wireframe node to a vertex group.
I'm currently trying to make a procedural edge wear material. I'm aware of the pointiness and bevel nodes however it is hard to customize their falloff and shape. The wireframe node would be perfect for this but its problem is that it adds a wireframe to the entire object and not just the selected edges. I think it would be very useful if it was possible to restrict the wireframe node to a vertex group. I have no coding experience so I have no idea how hard this would be to add but I think it would make the wireframe node significantly more useful.
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I think it's planned to have a vertex group node at some point.
In the meantime, you can use vertex colors: {attachment vertex-colors-example}
And if you already have a vertex group set up and don't want to spend time repainting it in vertex color, you can convert it from the vertex paint mode menus: {attachment vertex-paint-mode-menus}