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@mirceaandreighinea
maybe people do custom frames with a steeper seat angle (than they should) and still using a lay-back seat post because IF they want (or think they will) to move the saddle more forward then they will install easily a zero offset seat post.
BUT, if from the start they build the frame with a slacker seat angle for a zero offset seat post, later they will have no choice for moving the saddle forward. or they can do it with a seat post that has the offset towards the front, but that will look really ugly for most people.
within this picture i can see the Cervelo bikes. R5 Project California bike was build for a zero offset seat post, the geometry is basically the same like the others but with a slacker seat angle of about 71 degree and a longer top tube. some pro riders have this bikes. but i do not think that Dave Zabriskie would like this bike, as long as he's using a zero offset seat post on a "normal" 73 degree seat angle bike.