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I think it's a fair question - why aren't road bikes built with a much steeper seat tube angle - I know UCI rules dictate where the saddle can be in relation to the bottom bracket but it's not as if everyone has the saddle tip as far forward as the limit allows. You'd think it's the same principle - open the hip angle and allow you to get lower at the front . Pros do generally ride low - if you look most have the stem right down on the head tube these days - but they don't seem to ride a steep seat tube angle - I suppose they train to have the flexibility to do it. I know Lemond used to talk about being further back behind the bottom bracket brought the glutes into play so there may be something to do with efficient recruitment of muscles as well as comfort.
There's also the fact modern road bikes tend to have much wider bars than was the case some years ago - 44cm, even 46cm bars - it can't be aero to be that wide at the front.
fat buddha wrote (see)
...if we all wanted comfort we'd be riding recumbants