An open floor plan leaves more room for light, a good flow of energy through the home, and easier access for many people. When researching modern home plans, a lot of people choose open floor plans in the contemporary style just for the sake of sheer convenience. When they have small children, it is easier to see across the home and make sure that their children are safe without having to constantly be in the same room. There are plenty of reasons for choosing a floor plan that is open, but this is actually a popular reason.
Ranch style architecture originated in the United States in the 1920's, and it became very popular after World War II as cities expanded into suburbs and inexpensive tract homes were needed by a growing populace. Ranch style houses are most popular where land is inexpensive and the weather is mild, since these homes particularly lend themselves to outdoor living. The low, earth hugging look with clean, modern lines of the ranch style is derived from Frank Lloyd Wright's prairie style architecture.
The building site also needs to be taken into consideration for school districts, noise levels, and neighbours. Different sites will also require different types of permits at different prices. Planning a new home can be challenging as it is a big investment, so the new home should meet all of your specifications. Depending on what stage of life you are at may also indicate the style of design you need to consider.
Aesthetics is in the eye of the beholder, and it depends upon the prevailing tastes of the time. A building's functionality, or fitness, is a matter of how well it accommodates the purposes for which it was built. Its structural integrity means soundness - will the building last over time? Historically speaking aesthetics has usually trumped fitness as the overriding factor in architectural design. Classical architecture was preoccupied with articulating features on walls and facades. Modern architecture is equally concerned with aesthetic formalities, such as form following function.