Agree that there is lots of BS going on with weights. Manufacturers omit the pedals, use the smallest frame etc.
People are also too optimistic or have rubbish scales – aracer you quote 21.5 lbs for a Scott Genius. Sorry, but rubbish – Scott website shows Genius 10 carbon which goes for about £3500 as 25 lbs.
The issue of weight is way overdone unless you race. Pedalling efficiency, comfort, cost, longevity of frame and components all have to be thrown into the mix. Do you buy a car on the basis of what it weighs?
Blur LT2, RP23, Pikes, X9, Hope Minis, DT 4.2 – 30lbs