I have not personally witnessed seven cracked 1911 frames. However, it is admittedly easier to find this sort of thing with google. The point I and I think Joe was trying to make is that sometimes stuff just brakes. Glock frames can crack over time. 1911 frames can crack over time. There isn't a clear durability advantage to polymer as you claim.
I haven't either. But I have personally seen 3. (2) 1911's and (1) 92F. I also remember STORIES from military armors about this issue. I also was around and saw aftermath of a Glock Kaboom. I won't start another issue by stating what I think was the cause tho. I will only say is was not a .40.
I do agree that anything can fail. And I was also aware that there are examples of Glocks that have cracked also.
As for the clear durability advantage of polymer, I will let it rest for now. I have typed about this now since page 5 I think. LOL I could of whipped out 500 rounds in that time. But hey, this was much cheaper !