It has not affected the quality of the writing, but I felt that the flaking was strange, as I do not put any undue pressure on the nib. That said, it does not seem as though even the roughness of daily pocket-carrying would or should cause this to happen.
It is unfortunate that this happened. Now that this Preppy has been converted to an eyedropper, it will remain safely at home, hopefully free of further flaking. Has anyone else had this same "problem?"