The esthetics of film, from the early days, has presented filmmakers with the idea that 1.33 screen format is acceptable. However, this creates a two-person, square-like viewpoint that limits the aperture size for the filmmaker.
1.33 Aspect Ratio in ‘The Big Sleep’
When widescreen was introduced, with much disregard to the dogmatists of film, it posed a different problem: what to do with the extra space. It created a whole new language in film, another aspect that needed to be thought out by the director. If two people are sitting far apart, it gives off a sense of lack of trust, or lack of feeling; so if they are meant to be close, they need to be in the center of the frame, and the peripheral of the frame must be filled with scene-decor.