" The world just does not fit conveniently into the format of a 35mm camera,” W. Eugene Smith
My final image presentation is a print. I tend to not like the 2x3 aspect ratio for prints preferring, 4x5 or 3x4. For portraits I often use the classical 5x7. For some shots I use a square format. By limiting the aspect ratios to a set of predefined values, I only have to keep around a limited subset of precut mats. I also tend to know the aspect ratio of the final print at the time I visualize the scene prior to taking the capture. In the case I end up with an oddball aspect ratio, I will have to order a custom precut mat. That not a big deal but it adds to the timeline of producing the print.