But you don't need multiscales in order to have headless, which balance better, are lighter, more transportable, have string tension as even as headed parallel-fret instruments, and have the same range as a multiscale with the same number of frets and strings. Plus fretless is a lot easier on a parallel-unfret bass. And possibly the most famous proponent of fan-fret, Dingwall, still hasn't produced a headless, so all of those advantages are lost.