I lean towards Tara’s feelings but understand your message PK.  I have posted 1,282 photos and have had two turned to 2D.  A very small percentage!  I accepted the change of the tapestry photo since it was basically flat and I learned from that.  And I agree with your explanation above PK.  The second was a photo, of a huge 3 dimensional piece, of over a hundred metal butterflies.  It was layered to about 5 to 6 inches (12.7 to 15.24cm) deep.  I guess that what I am trying to say is that the photographer knows his/her photo best.  I have never used Photoshop or any other postwork other than a minor change in lighting.  But I do enjoy those that postwork the background to enhance their main subject or object.  I also enjoy the Fractalius software filter even though it can alter the entire photo.  I would not like to see either process lost from the photography genre.