But I would be interested in learning more on which ways his "approaches and philosophy" differ from Jon Cone's. Thanks for raising this issue, for possible discussion?
Paul uses the term "open source" to describe what he does. He uses materials that are readily available and seeks to find inexpensive solutions for black & white enthusiasts. He tries to make the point of entry accessible to everyone.
Jon is a printmaker who caters to very discerning artists, some of whom require exotic / unique solutions to achieve the end print they desire. Some of the solutions he has developed over the years he has chosen to release as product. His operation is "for profit", and his solutions tend to be more costly.
Paul develops profiles to support printing from both Photoshop and QTR. He uses QTR "out of the box", so his profiles assume a linear input.
Jon used a proprietary software solution he had developed to make prints and he later ported this approach to QTR. His profiles assume a Gray Gamma 2.2 input.
There are also many similarities, one of which is the passion both have for black and white printing.
My point is not to ascribe a greater value to one approach or the other. Rather, it is to say that the solution set from each is different, as they have differing perspectives and priorities.
Terry.