I've been putting a lot of thought into this. The saber staff is obviously modeled after the Quarterstaff, a powerful and very adaptive weapon. Part of the strength of the Quarterstaff is the availability of striking surfaces, but the biggest strength is that any part of the staff can be held.
Not so with the saber staff. You can only hold it about the middle. At no time can you grab it by the glowstick part.
On top of that, accidentally hitting yourself with it has devastating consequences. Every attack also needs to be considered if it was going to hit yourself, limiting your actions and abilities.
You may now all discuss how awesome / right I am.