Some shops will "fit" you for a bike by taking basic measurements, such as your inseam, but they're generally only used to select a prefabricated frame with the correct height.
Then the specialized software spent about 30 seconds turning the raw data in to useable measurements for inseam, waist, chest and just about any other body part that could be of import to a tailor.
Your height, inseam and weight are all taken into account - even the possibility that you'll be toting around a toddler in a child seat on the rear rack is considered in the equation that decides the final shape of the frame.