Man, thanks for the activity. I never doubted what you were saying and by no means was I calling you out or anything so I hope that wasn't what spurred you to action my friend! I'm still maintaining, though, that sewing is stronger than the double capped rivets and that removing them is pretty easy using needle nosed pliers.
I've used the double capped rivets to affix straps to totes which is exactly the scenario you tested. They haven't failed (to my knowledge) but ever since I saw the video testing the ez rivets, bit/burr, and sewing, I've only used the double caps for aesthetics and have always used stitching as the main means to join the pieces. I did use them early on on the corners of the opening of a sheath for a Leatherman and they pulled away because that was the wrong use. But yeah, ever since, I have relied on stitching or bit/burr rivets. Also, I do use the correct length shaft but not always the setter and anvil, so that is a huge difference that I'm sure matters. I do whack em pretty good unlike a lot of the videos you see out there...I don't know how a lot of folks get away with some stuff. I love Corter's videos but seeing some of his double capped rivet work in them makes me wonder if he lets that stuff leave his shop.