Which might not be a consideration whatsoever. It isn't for me; I bring my laptop to the office, or from the office, and am never using it where weight makes one bit of difference.
Again, not for me. I throw it in a backpack and because I'm in the US without good public transport, the distance I carry it is precisely from my house to my car (25'), then from the parking garage to the office.
I "carry" it maybe a total of 3 minutes. The weight is literally not an issue for me.
Commutes can be very different, too. Someone who walks and uses public transport will feel differently about the weight of their laptop than someone who just has to lug theirs to their car and across the parking lot. Same with travel: Flying with just a carry-on bag and crossing big airports on foot makes lightweight laptops a lot more attractive.
Which might not be a consideration whatsoever. It isn't for me; I bring my laptop to the office, or from the office, and am never using it where weight makes one bit of difference.