Then, of course, in order to make the guns run more smoothly, we (and I do include myself here) polish the plating, sometimes polishing it off, in our quest to reduce friction. In other words, we accelerate the wear in order to speed up the break-in, and in so doing we probably shorten the service life of the parts.
We could moderate some of the polishing in favor of longer life of the components, but consider that the people doing this polishing are never going to have dirty or un-maintained guns: it's just not in their (OK, our) nature. So I happily polish away, looking for the ultimate in a smooth Glock.
The wear on your firing pin concerns me, though. If Glock doesn't swap that out, I would do it, mainly because I'm concerned that you may have cut through the hardening on the part. This assumes, of course, that it was hardened in the first place, but it's real hard to learn much about Glock's manufacturing processes.