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I wasn't talking of the fact they are compact per se but the fact lots of them are not really well designed, as @Sumo said they are often misunderstood, and an example is the one posted above by @Dammit, where I challenge the owner to sprint on the drops out of the saddle without having their hands sliding down, loosing grip or excessively twisting their wrists in a unnatural position.
Guys at Cyclefit in Covent Garden told me lots of compact bars are actually useless, the biggest example are Ergonovas.