I suspect that poor placement or poor rock has as much to do with gear "failure" and accidents than zippering or the gear breaking.
eg. If I'd placed a no #2 nut or above, and it was a good placement, I wouldn't be concerned about it breaking due to my force in the event of a fall. I'd be a bit nervous with a #1, and anything less than that I wouldn't want to fall on.
No science behind this, just the gut feel....
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