Depth of field is an artistic tool used by photographers to direct the viewer's gaze. It has a reputation for being a mark of a pro photographer because
The larger the camera's format, the shallower the depth of field for a given aperture. Depth of field control is extremely difficult on a cell phone camera.
More expensive pro lenses, such as the "Nikkor 70-200mm f/2.8G ED VR II Lens " ($2396) lens have wider apertures than a (sort of, kind of) similar consumer lens such as the "Nikon 55-200mm f/4-5.6G ED AF-S DX" ($159)
However. there are photographers, such as Ansel Adams who used "camera movements" to maximize depth of field, as well as photo journalists who consider deep depths of field to be an important tool for objectivity and for telling narratives.
A pro photographer uses depth of field as a compositional element. A game's graphics engine would have to be programmed to use depth of field to direct the player's gaze to fit the narrative.. A constant shallowness is likely to interfere with game play.
(Back in the old days, fog was used to obscure draw distance limitations. It sometimes looked decent, but in real life, piloting an aircraft through dense fog is harder than piloting through clear skies...)