You always want to balance jib and main with the CB and rudder, and usually you speak about the boat (or the helm) being balanced. Therefore, if you call out the balanced feature of a jib, that most definitely would seem to refer to some other feature. In this case, the fact that the jib pivots around a point aft of the tack, which balances the sideways force on the jib. As Jdoorly writes, this is in perfect analogy to a balanced rudder blade.
In higher winds, this could be interesting (or if your crew is rather lightly built or very young). However, if you pick the right moment to pull the jib across and cleat in the jib sheet before the jib has filled, then you don't have to "fight it". If I sail with a young and eager crew and they don't manage that trick, then I just luff up a bit to unload the jib as needed so that they can adjust the trim.
All this, of course, is part of my general skepticism towards this feature - but, as I've never sailed a boat that had a self-tending jib, I may simply not know what I'm talking about