It makes perfect sense if you've ran both. A joystick configuration by nature is sloppier. If I'm down to moving a single tooth on the bucket 1/2" in any direction I'm better off with 3 stick/4 stick. If all I'm doing is digging a trench or digging out a stump joystick is much better.
Even a sloppy joystick swings smoother and with more accuracy than treadles. The last Case I ran hydraulically fed the swing last. So if I've dumped the bucket and am swinging back toward the job and moving the boom/bucket at the same time the swing is moving at a set speed. If I stop moving the boom/bucket before letting off the swing it would radically speed up. Not good when I'm swinging toward an object that I value.
You'll figure all that out.