My ZBook is over 5kg, my car doesn't seem to mind.
My point, weight unknown, is that Apple are so focussed on thinness they have forgotten that I have "legacy" hardware lying around, still in use. I refuse to spend $ on replacing working external drives, usb sticks and more (home studio sound card for example) simply because some company has decided I need "to get with the times".
Apple want a consumer market in which users consume, consume, consume like tech is a loaf of bread. I'm not buying into that.