DeWolfe’s approach certainly contradicts the approach used by many other photographers and workshop teachers. I have taken his workshops and those of Dan Burkholder, a photographer who is famous for creating copious numbers of layers .
Each approach has value. One may argue that Burkholder plays it safe by always providing a way to correct/revise or delete a considered change. Burkholder admits this, often saying that he is afraid of commitment. Hence the use of layers
One can argue that DeWolfe’s approach is very traditional to the art of printing.. Like master black and white printers he starts with the negative and “performs” to create an interpretation of the image. If he errs, he is happy to delete it, just as many traditional printers trashed prints that fell short of their goals or that were failures due to user error.
DeWolfe states clearly in his workshops and texts that he thinks an artist should act decisively. It seems that decisive for him means operating apparently with no safety net (layers). But one must recall that like the traditional darkroom printers he always has the negative. Part of his protocol is to copy and save the original.
As far as the PercepTool is concerned, well a free trial is a good deal. One may find the percepTool valuable all the time, or one may find that it has limited value. I have never got the impression that the PercepTool is a magic wand; instead it is a piece of software, like Lightroom or Photoshop or the Nik system that s photographer may find valuable, or may use occasionally or never..
That is the key, isn’t it? What you or I find valuable is good; what we don’t find valuable is bad? Maybe not. Maybe we need to be a bit more tolerant of software and approaches we have yet to try.