The Swiss cheese model is what people use to sell you more 'security' related software systems that inherently involve more problems. (Also cheese is not very durable, even the kind without holes.)

Swiss cheese applies to more than just security systems.

Hiking with two GPS-capable devices is Swiss cheese.

That is redundancy in my book. I don’t expect holes in my GNSS devices. And if you want to be sure, bring three, because two GNSS units with different readings are not very helpful.

I don't expect holes. But both devices are exposed--something could happen to one of them. And since I like going out in the middle of nowhere I assume I either have to get myself out, or if that's impossible summon help. I don't want a single point of failure on either of these.

Fair enough. A paper map and the ability to navigate offline would be a nice backup, too. Not that I wouldn’t use GPS in distress.

That was an enlightening read, considering the colloquial meaning of "your firewall security is like Swiss cheese"

https://en.wiktionary.org/wiki/Swiss_cheese#Noun

What's next? A system so secure that you can drive a truck through it? A honeypot in the center of a wasp nest?