That's a very interesting explanation of sewing machines. The only thing I could take issue with was that you could make a shirt in 30 minutes. I can't even make a simple top in 30 minutes much less a shirt.
Brother has made a demo machine with a translucent housing so that you can see the inner workings. I saw it at Quilt Festival. Unfortunately, I never got to see it working. I thought it would be really interesting.