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@G-bitch
It's simply to facilitate fit - for example I had to swap the inline post on my road/audax bike for one with 25mm setback because I couldn't quite get the saddle back far enough to achieve the proper* 90 degree (dead straight shin bone - hang a plumb line from the knee) angle with forward crank at 3/9 o'clock.
Edit - forgot to add. The key component of a 'more relaxed' set up is to simply reduce the drop from saddle to handlebars, it makes far more difference than people give credit for even if you are still quite stretched out. Some frame geometries facilitate this (think Spesh roubaix/allez/langster) whilst others have a more 'racy' geometry which would need lots of spacers on the steerer as well as an angled stem to achieve a similar riding position (like the Ribble winter frames or Cannondale CAAD frames). If you're like me with long legs and relatively short arms then it's a right PITA.
Hope that helps.
*proper for my riding style/purpose - would be different for say a TT set up.