I'd love to see somebody who is trained in JJJ go against BJJ Boy and to put him in his place. JJJ, most schools, are trained to take down your opponent as fast as possible. They use more than wrist locks. They do just about all joint manipulations along with some chokes.
Like others have said, just because JJJ isn't suitable for the ring doesn't make it any less of an art. By your logic, Krav Maga and Systema are also wastes of time since they can't be used in the ring even though those are relatively easy to learn and can be brutal.