The bottom line is this: if you have a fig variety that makes breba figs, then a dormant cutting, particularly a tip cuttings will already be programmed to produce a breba crop. When you root it, it is programmed to make the breba crop, which often begin to form before the first leaves appear. This is fine on a tree, which has roots to support it, but on a cutting you want the energy to go to roots, not fruit, so it should be removed.