Because the current line charts with a wide variety of sizes, both large and small.Wastes space, line charts are devised the power plug can be rotated 360 degrees around to fix line size charts.
The current line charts with a variety of both small and large , the space line charts, the company that invented the plug can be rotated 360 degrees to fix the cable charts unequal.
Due to current power cord has a wide range of sizes for both small and large.The waste area and therefore invented the power cord plug can rotate around 360 degrees to fix the power cord uneven.