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@EdwardZ
I just compared the length of the rails on my Brooks Ti Swift (from the 1990s) with the rail length of my NJS Kashimax... Swift has longer rails.. Compared it to a very modern Fizik Antares VS.. same length as the Brooks but offset forward.. Have a Brooks Pro from the 1970s but from memory it was about the same as the Swift but with a more horizontal rail angle.. San Marco Rolls saddle.. shorter.. Selle Italia SLR.. pretty similar to the Five Gold... Looking at these saddles the rails are not in the same place, have also different angle orientations... different designs also to where one sits and move about... Using a straight seatpin one would be forced to have quite different sit positions, one from the other.. None give me the feeling that I could get away without a setback pillar and, of course, each bicycle that sprouts these... And the bicycles.. all--- including the track machines-- have somewhat slack seat-tube angles around 72 degrees (road a tad steeper than track!).