> Guardrails are external classifiers

I can't help thinking of them as the terrible "security" scripts of yesteryear (often but not exclusively in PHP) which would test input variables for a "suspicious" substrings like "--" in order to "fix" an unresolved deeper SQL injection flaw. They only partly worked, and surprise-surprise now nobody with a surname like O'Anything can make an account.

Unlike that situation, there's no known route to a proper fix for LLMs today, because the bug is the feature, and once someone has built a system giving you all that recurring revenue, it's hard for them to abandon it due to a few isolated hacking incidents...