A couple of points:
Being a bit of a red neck living in a windy area, I anchored some decorative flags for my wife by installing grommets in the 4 corners of the flags and zip ties to some steel ironwork. In the past year I had 2-3 grommets rip out of the flags sun rotted cloth, not unexpected.......and at least 8 zip ties fail, not sure if it was the sun or the rubbing on the iron work but it was unexpected. I am really rethinking any use of zip ties outside of cleaning up some wiring messes (their original purpose)
Critical plumbing on boats (thru hull fittings and gas lines) are always double clamped. I am thinking the belt and suspenders approach is one I am going for on my gear. I don't care if its life support or not, I want my gear to work on every dive. The are too frick'n expensive to blow even though I can swim up. I am willing to give up features, pay more if needed, maintain KISS, but I want reliability on the water or under water.