Most of the folks who complain about the extended grip tang either already have an older model with the standard grip tang or would rather seek out an older model than go to the trouble/expense of having it ground down to match the specs of older models.
Besides, in addition to the grip tang extension being aesthetically displeasing, most express concerns over the supposedly diminished reliability of S&W-made models as well as the upcoming Fort Smith production, ergo the solution isn't necessarily quite so simple as reshaping the tang.
Personally, I'm not bothered by the extended grip tang, (it's the "fangs" on the front of the slide that bother me) especially since it allows me to grip my PPK/S just as I would any other pistol without having to worry about slide bite, and my particular model has functioned perfectly so far in spite of being a late production S&W model, so I'm not particularly concerned with reliability either, but if either was a concern then I would sooner seek out an older Ranger/Interarms or Manurhin PPK(/S) rather than a S&W which I would have to have aftermarket modifications made to in order to achieve the same level of aesthetic appeal.