Wow...nice catch on that one Robo. I've used the P-mags, probably more than any of my other mags for some time now, and have never had an issue. But...I've always loaded with a Lula or singles by hand.
And I didn't see any probs with the brass in the photo. They will get a few blemishes here and there just from normal handling, loading and storing. But I didn't see anything that would have caused any feed or use issues. But then again, to each his own...if someone needs their brass all shiney and spot free, go for it. But the ones in that pic looked fine, but that's just me