I have been on this site since it's first year and have taken many aircraft photos over substantial periods of time that show it's current dated condition, or even say, a change of color or colors with new paint jobs. These photos show that the owner or subsequent owners are taking care of the aircraft with say, a new paint job. I have gotten many thanks from the original or current aircraft owner for documenting the appearance history of their airplane.
I believe this has not been fully considered in the discussion of the number of an aircraft's photos here and that these photos show a current, dated condition of a particular aircraft which is important. It shows if the aircraft owner is taking good care of the airplane. This is important also if and when the aircraft may be put up for sale. I have had a number of owner requests for aircraft photos usage which I always grant. I don't sell my aircraft photos. A number of photos of an aircraft may be important under a number of conditions; even while documenting the building of an aircraft. Perhaps these documented issues have not been fully considered.