I'm glad you asked. It made me think about why I started doing this. It is something I do and had forgotten where the idea came from.
There were some postings (I think they predated this forum) about removing material from cuttings (fruit, roots, branches, etc.) disturbing the cutting and putting it into some form of shock. I'm not sure how valid the arguments are. If you damage the fruit, it will not grow anymore thereby reserving the energy stored in the cutting for roots and leaves. At the same time, you have not cut anything off the cutting to disturb it. It will recognize the damage fruit and abort it.