I am very familiar with the process of moving the quilt in a very short arm machine. Ask anyone who has quilted a king size quilt on a vintage featherweight and he/she will tell you that while it most certainly can be done, having a 20 inch arm (called a longarm by the manufacturers of the machines) would most definitely make the process much easier. While I recognise the difference between a floating/moving longarm vs. a stationary one, it would seem logical to recognise the difference between a 'made for home use' machine vs an industrial machine, which a 20" arm is. Granted, it doesn't matter if you have the biggest, most expensive machine made if you have no skill in using it. But if those two machine categories are the only categories, that would put the rest who use portable machines at a disadvantage, IMHO.