That was my main point, you missed the fact that the factory pushes out a pin before peening. If they didn't it would be just as damaged as any pin removed after some use of the chain.

With all the years of experience that I have in metal working, I'm truly skeptical that pushing the joining pin out, at least from right to left (opposite the way it was put in) is really any worse than pushing a peened pin out. I'm also surprised that Campy even suggests installing a new joining pin into a link that's been separated after peening. They absolutely don't advise that with their 10 speed chain, unlike Shimano whose 10 speed joining pin works the same way. Both of those pins merely have a short length with an increased diameter to create an interference fit (and a much weaker connection).

I'd much rather rely on a master link than several joining pins.