[ctdonath]

If you want a 1kg notebook that's 100x the power of a room-sized $40,000,000 Cray 2 from back when, you'll have to leave off things like connectors, removable covers, generalized internal interfaces, empty space (for varying-sized components), beefier batteries (to run whatever you plug in), etc. Some of us value compact over modular.

You want "repairable by user for cheap"? Such is eminently available, and will decidedly not weigh 1kg.

[dmschulman]

You're right, my Thinkpad X201t weighs 2.89 lbs. That's 1.31kg, it's so difficult to lug around but at least I can replace the hard drive, RAM, keyboard, CPU fan, battery, and fundamentally keep it maintained until the processor fails.