I have used Rattan wrap, leather laced, leather wrap, cordage winds, an left it bare. The wrap is like a pictue frame. It only enhances the work of art. And matching the frame to the painting is the way I decide. You wouldn't frame a victorian scene painting with a rustic rough hewn frame and you wouldn't frame a rustic outddor scene with a gold gilded fancy frame. Match the hatch is sound way to decide. After all, our bow creations are a work of art. About bare handles, sometimes a work of art can stand alone.
In other words, bare or covered, it is the artistic expression of the bowyer.