Off topic but - there must be a point where the rider can be too light and therefore not have enough muscle strength to actually pedal the thing very far?
And are all the weights quoted by your good selves with the addition of real world items such as - pedals, tools, computers, lights, saddle bags, bottles, etc etc. if you are just weighing it as it came out of the box what use is that? And if you carry your "stuff" in your pockets you need to include that aswell I would have thought, as it would otherwise be in a saddle bag attached to the bike. Surely the weight figure needs to be as "you" would take it out for a "reasonable" ride.
For instance, my bike comes in at around 9kg bare but with the addition of all the tat goes up to something like 10.5kg.
Edit. And if I fill both my bottles it goes up to 12kg!
Edit 2. If I fill both bottles and I get on to ride, my "all up" weight is 87kg.