I wonder, do the ThinkPads with that feature have a thicker lid than Apple laptops? I suspect they be thicker anyway because of the touchscreen, which would then provide a few millimeters more room for a shutter. But I'm completely speculating.
I have a new X1 Carbon, and I don't have a MacBook to compare but I can't imagine needing my laptop to be lighter or thinner. It easily fits into any bag and I can carry it with one hand with no worry.
I will gladly trade a millimeter of thickness for increased functionality. It's the same thing where apple will ruthlessly optimize for thickness to the point where they can't cool the CPUs. They literally prefer form over function, as if the tool I use all day every day is an art piece.
