We knew we weren't, deep down. Some people did better than others at writing more secure of course. It was just about good enough in a world where – compared to today – it took much more time, skill and effort to find bad bugs.

The mistake is to think that the 'magical' LLMs don't write buggy code and that there isn't some tradeoff in using them. There are always tradeoffs in engineering.

later

And, security is always relative to the adversary and landscape, which has massively changed recently.