Of course, that has always been true to some extent. Professional photographers have always used darkroom / developing techniques to get the results they wanted. But the tools available to modern photographers are so powerful and so comprehensive that the relationship between photo-as-taken and photo-as-printed seems to have been essentially broken.
Here is a great picture, which I like very much. But I do so knowing that the scene it is representing may, in fact, have never occurred.
Click on the picture to go to the photographer's site, then click on that picture to go to full screen / black background for best viewing. When done, click on photographer's name for more of his pictures.