[jerlam]

Experienced cyclists often replace all the contact points on a new bike to meet their preferences, including saddle, pedals, bar width, and stem reach. It's just like adjusting the height of the saddle to match your leg width, and replacing the stem to match your body/arm length.

You would have to know this before buying a bike, which most beginners wouldn't, and most bike shops don't want to offer this service because it costs money in parts and labor.