GN node: extrude curve points
Seems like a relatively simple idea.
Currently the workflow is like this "convert curve to mesh extrude endpoint vertices and convert back to curves", but it has it's own issues where you need to capture some attributes but even then some curves types will struggle and get changed too much like bezier
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It's possible to mimick the effect without converting the curve to mesh by resampling the curve with 1 more point and offsetting the points to their previous position, which gives you one additional point. But I agree this would be nice to have it by default
This is probably "hard", especially for NURBS, and... what sort of extrusion do you want? I guess straight line (G0 continuous), but there are other options that maintain G1/G2 continuity that some users might want. Still, seems like a reasonable idea.
You're absolutely right it's a rabbit hole like everything in 3d x)