Frankly that weight is from the modularity of the system. To build something repairable/modular requires scaffolding this isn't necessary if you solder and glue everything together; that's why companies like Apple do it. You are giving up some things in order to get the promised repairability of a framework.

If you want the lightest laptop with the longest battery life, you'd get a Mac. If you want the best bang for your buck go with a basic Ultrabook. If your willing to have a bit more weight, size and a bit less battery in exchange for repairability/customization, that's the niche framework fits well.