I don't understand why they don't just create a program that will convert a simple line drawing scanned into a computer into a cutable path? It's realy not that hard for a programer to create one. Why confuse us with a program about as advanced as one from the late 80s.
I'm not a programmer, but I have used a variety of Raster-to-Vector programs over the years, hoping for the same results you asked for. Many of them were merely a "good start" on a design, but nothing more. Arcs would come in as 3 million straight lines (I kid you not), often in pairs of 10's, trying to fill in the thickness of that drawn line with vector lines. The computer could only do so much with the information on the drawing, and tried to fill in the thickness of the actual lines as well.
More often than not, I would start a new layer in Cadd, and simply use this mess of a conversion as a basis of drawing the new design.
In that aspect, PathTrace is a lot simpler. Load the picture you want, tell it what size you want, then draw along the lines you actually want. Plus, you don't have to go through and delete the other 255 layers of the Cadd drawing so that it wouldn't accidentally get traced and try to cut.
AND, it is a lot easier than manually plotting out points on a drawing in order to enter it into Cadd. In the early days of Cadd (long before PathTrace), there wasn't any way to simply load a picture and draw on it. You had to manually measure out the points on the sketch outline the customer gave you, which meant a LOT of measuring if there were many arcs involved. I remember this dolphin puzzle I was trying to do the outline of.... by the time I was done, I was ready for a mahi-mahi steak!