Comment by ButlerianJihad

The corollary is that when it fails, you've no idea what failed, or how it failed, or if the "fail" is even valid or relevant, because you're abusing a service that isn't designed for you and isn't fit for use. So if it succeeds, you really don't know, because perhaps your train's WiFi router is responding with a spoofed IPv4 address while it goes through the Chunnel. And if it fails, you really don't know, because you DGAF about learning formal troubleshooting methods and couldn't be arsed to find out your upstream router's address in order to simply isolate your PING to a singular link, rather than relying on complex routing rules, especially those introduced by "anycast". And perhaps you can manually dig in when your manual checks fail, but your AI agent or automated script DGAF about your nuanced knowledge that 1.1.1.1 isn't your upstream router; in fact it's not yours at all and has nothing to do with your network topology. But at least it looks elegant.