Arm chairs and sofas are often what people have, and there is very good reason for that. They have worked well and there is no need to change, though they do change in style and comfort as time goes on. A good chair is worth its weight in gold for many reasons. Some guests strongly prefer the arm chair to the sofa because it allows them to sit alone. Some like this, and others do not, but those who are not close friends or family often don't like to be too close to someone they don't know right away. Many gravitate towards the arm chair for that very reason, even if they don't really realize what they are doing.