Got overtaken by my mates front wheel in the alps a few years back. Broken arm and nasty faceplant but lucky we were close to the car park as we later found out his insurance wouldn’t have covered an evac. That was a loose hope qr.
Had 2 qr come loose, one at the end of cut gate where it dropped and re-aligned dropouts over my disc. Bent the disc back in enough to keep riding. I had heard a rock hit the frame seconds before the wheel dropped out (and the qr was pointing backwards).
2nd was my front qr coming loose after about 2 hours of riding around kirroughtree. No damage done. I am a lot more careful with the qr now and often check them before fast descents or rocky sections.
I think until you see it for yourself these qr stories are always someone installing them pointing the wrong direction, or too loose. I have always been careful putting wheels in the dropouts but have been scared by the qr coming loose. Doesn’t take long to check…