In my experience, writing a squadron 540 was usually a secondary duty given to a junior officer who had normally recently arrived on said squadron.
The quality of 540 entries could thus vary considerably, depending on the literary skills and enthusiasm of the authors. I do remember reading several missives from the AIr Historical Branch (usually from a retired Gp Capt?) during my career lamenting the poor quality of input, and asking for far more detail, including mission maps, photos, etc.