Tommy-
I think you put up a valid argument when it comes to restoration. It is clear that you feel that evolution is valid and should be left alone. I question whether you would call an potentially overzealous greens chairman with a particular affection for tree placement "evolution." This is not to say that it is the case at Merion, but I have seen it (at Manufacturer's) happen, and in my opinion, detrimental to the original design. I think there is a distinction between restoration and re-design, and I think what is happening in many places is either the latter or a hybrid of the two. Ultimately, the shots intended by the designer should be the shots re-created in a restoration project. In some cases, this may or may not have been accidental on the designer's part, but nonetheless has resulted in a great hole. If we try too hard (like the fairway bunker on 14), we get a crappy result. For the record, I feel that 95% of the job done at Merion was stellar, and recaptured much of the original design.
TEPaul,
Don't have much to say other than you are 100% right and we can only hope that designers are using as much care as you have described in your post.