I honestly don't want to come off like that, but if 2 vs 4 lbs is someone's primary concern then it sounds like a great laptop.

halving the weight is a problem ... it could be solved if they used something other than allu for the body, maybe go for carbon or a hybrid allu/carbon case.

have you ever considered getting an Air and using AWS for power? i might be clueless, thinkpad user here. and i lob a 19cell flatbattery around that weighs at 0.5 kilo itself.