The only discussion there can be is, who will step up and implement it?
Draft workbench has BSplines and Bézier curves.
Sketch now has B-spline support.
Draft has a Draft2Sketch conversion utility that is only partially working since it strips B-splines and Bézier from the conversion process. This is a legitimate feature request and one that could have indirect uses, like DXF support when exporting sketches containing B-splines...