OCaml (the language I use in the post) is an extremely memory safe language, but there are plenty of higher level logic issues that spring up.

LLMs are extremely good at finding corner-case vulnerabilities in C bindings even within a memory safe language; see for example the fixes in an OCaml crypto library here: https://discuss.ocaml.org/t/the-series-of-mirage-crypto-rele...

Yeah, but there's already plenty written on that topic elsewhere; the OP is making a distinctly different point and everything else in it still applies, I think. Even if you are using a memory safe language -- if you are developing security sensitive software, you need to understand that exploits can now be researched, developed, and deployed in hours (or for stupid bugs, minutes!) instead of days or weeks or months. And this process can now just be massively scaled up with money and compute. It was not like this even 24 months ago.