I had a 6 x 9 camera with view camera capability which I used for some 30 years before moving up to 4 x 5. Using movements immediately places you out of the range of the usual kind of photography. These days the gap is growing even larger since fewer and fewer people in the "small format" range even use film.
But I've found there are some significant differences between 6 x 9 and 4 x 5 which go beyond the size of the film. With my 6 x 9 camera, for example, I seldom needed to use tilts or swings because I usually had more than enough DOF without them. Similarly, I seldom needed to worry about subject or camera motion, particularly in daylight.
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