This very question has been asked a number of times before. Maybe an answer to why this is not superior to legs (or any other appendage) is in order.
Your head, arms and legs don't move through magic. They move because they are attached to other bones by ligaments, muscles and tendons. There are ligaments surrounding each joint holding it in place, and blood vessels feed these living tissues as well as the bones themselves. When joints are forced beyond their anatomical limits, ligaments tear, tendons tear or snap, sometimes muscles tear, and blood vessels rupture. (That's why even a mild ankle sprain results in swelling.)
The closest thing to full rotation of the arms is found in gibbons (picture these animals gracefully swinging through trees.) The range of motion of their arms is amazing, and occurs due to elongated tendons, significantly different shoulder bony anatomy, and greater forelimb muscle strength. But it is not, cannot, and will never be 360 degrees, nor is there a need for it: they simply change hands to achieve their forward movement. If they need to change directions (go back) they pivot/turn around, not swing backwards.
An owl's head can rotate an astounding 270 degrees in either direction. Deceased owls were studied at Johns Hopkins to determine how they can do so without keeling over.
If humans attempted to turn their heads as quickly or as far as owls do, artery linings would tear, causing blood clots to form and potentially leading to a stroke not to mention broken necks, explained study author Dr. Philippe Gailloud in a statement.
To understand the details, read the link. It's short and of interest. Still, it's not 360 degrees. This is true for any joint in the body.
Why? Because it's physiologically impossible. Full rotation would tear apart the very things necessary for any motion at all in living animals. So no wheels or propellers, please. At the very first 360° rotation, the joint would be rendered nonfunctional, which would very likely result in a much earlier death.
People with Ehlers-Danlos Syndrome have stretchier ligaments allowing more extremes of motion, but that comes with its own problems. So it's not "better".