A definition: depth of field (DOF) is the portion of a scene that appears acceptably sharp in the image. Although a lens can precisely focus at only one distance, the decrease in sharpness is gradual on each side of the focused distance, so that within the DOF, the unsharpness is imperceptible under normal viewing conditions.
The concept is a bit more than simply of interest.
I have friends that grab bits that are in focus without considering the depth of field.
In truth I could give examples of those that seemingly discard any frame of reference. I’ll back-fill some later on … just think about the concept and look at YOUR friends.
ETA: Agenda driven, even on a micro scale, is another way to define depth of field.