I got the chance to read a copy of Art Jones original White Paper. Loaned to me, it was passed around like the holy Bible. I was 16 at the time and the year was 1988. Jones departure from the accepted training ideas at the time big time. One of his first inventions was a wrist/forearm device.
Jones believed that the common BB was a very effective tool for achieving muscle and strength gains, and in a relative short time. But that did have limits. Hence the three phase nautilus designed cam/gear. A contracting muscle has three phases when going through a full ROM; weakest, middle and to the strongest phases. With the nautilus cam, all three phases were worked to near their fullest abilities. With a BB (or DB) that's never going to happen. Going to take way too long to give examples of all this..so a search would be advises, if interested. (just to note, the closest approach to the function of the nautilus cam may be different levels ((phases)) of pin settings in a power rack..a very rewarding way of training)
Jones also wrote about the affect on the CNS and points of failure with any given workout: momentary, temporary and complete failure. He also suggested 1 or 2 sets only, 3 the complete max on any exercise. Actually the CNS may be the key to progressive gains with any style of training...BB'er and certainly power or Olympic lifting. Full body workout were something else he greatly approved of, understanding that the body works and functions as a unit and should be trained that way.
Just a personal theory (whatever) but with the Nautilus machines, not being happy with that alone, guys keeps adding more exercise to the workouts. Which just produced an over load on the CNS, slowing and stopping any future gains. Example might be a guy hitting the back. Might use the Nautilus pullover machine, than do cable rows, pulldowns and DB rows....maybe 15 to 18 sets total workout. This is a case of more not being better...which can be applied to most BB'ing workouts. And when the magic gains are halted, they blame the Nautilus machine of not being good for them. Jones stated that short and to the point workouts would give the most results in the shortest time. I have always degree on this point.
I have use the Nautilus pullover machine. That one had a short lat/pulldown bar directly overhead. Idea was after the set of pullovers were done you immediately grabbed the short overhead bar and finished with curl grip lat pull down's. The original Nautilus hip/back machine was also outstanding. May rehab centers have Nautilus, and Nautilus style, machines. Believe Jones, and family, made all their big bucks from medical rehab design equipment.
Good Luck.