It is not about smoothness. Actually the magnesium bottom feels like some high quality polymer/plastic. And it is leightweight. Therefore it doesn’t feel like

It is not about smoothness. Actually the magnesium bottom feels like some high quality polymer/plastic. And it is leightweight. Therefore it doesn’t feel like metal and doesn’t transport heat/cold. Aluminum is a nice material for planes, cars or bikes but I avoid skin contact because it is uncomfortable. I guess like often it depends on how the magnesium made. Lenovo also uses for other parts high quality plastics (keyboard of course and probably the palm rest).