The inverse of this is equally true, which explains why mobile phone cameras with their puny 1/3rd-inch sensors seem to have virtually infinite depth of field no matter what you do.
Whether it's film, photo paper, a plate, or a digital sensor, the larger the area of capture area, the shallower the depth of field, all else equal. While there are a handful of factors that influence how much or how little background blur you will have, the most significant is the size of your capture medium. Blurry backgrounds were a given, and for the majority of a century, the struggle was to achieve more depth of field. The ubiquity of cell phones has all but destroyed the dedicated compact camera market after all. The technological barrier-to-entry has been steadily eroding in the craft of photography since the days of wet plates - a time when negatives were so large it was virtually impossible to have any significantly deep depth of field.
With the advent of miniature camera sensors and the technological march toward putting said tiny sensors in every pocket, casual photography has exploded in popularity.
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