I agree that it makes extra work. Not only that, but I thought the whole point of string quilts was using up scraps, and frugality is a large part of that picture. Using that applique paper in this way would easily double the cost! I was raised by parents who lived through war and the Great Depression, and I guess a lot of their attitude rubbed off on me - I'm just too old fashioned for this kind of quilting.
However, for a more complicated paper pieced block in something that was going to be a bit more special than a string quilt, such as a wedding gift, I think I could get over my resistance. I appreciate that there are talented people coming up with these products and innovations, and it's also fantastic to see that Sharon Schamber's daughter is carrying on with the great quilting as well as the sharing of information.
You can also tell she has young eyes. That tiny gray font is charming, but it gives me fits!