I love it when people suggest that what you're using isn't "good enough" or you won't utilize your camera to the fullest etc.
If the Bogen head works for you don't change. If you want more precision go to a gear or pan head. I don't think you would have any weight savings with a ball head because the head you illustrate is very light.
I found the 3D head like yours difficult to align so I went to something else. As they say "different strokes" etc.