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@gbj_tester
Like all bikes, they vary. Some are badly compromised in the areas of utility and durability, many use components with rider weight restrictions, but some pretty light bikes are made only from components proven on the Pro tour, even in the Spring Classics, e.g. Cervelo R3SL is Roubaix proof even at ~800g, Lightweight Standard wheels have been ridden on many TdF mountain stages and only seem to break if you hit a dog.
I can't recall seeing anything under about 5.7kg that I'd ride in anger, but I'm a 90kg sprinter, not a 60kg mountain climber. Oh, and you're not 'flying' down a mountain if you're only doing 40mph, you can go faster than that coasting down some of the short descents in the Chilterns and Cotswolds.