Introspection is the conscious examination of one’s own mental, emotional, and cognitive processes to improve self-awareness. I think Marc's critique here is a lot of what can be learned about past mistakes is outside of an individual's own failings.

I was recently reading a post about how the Claude Code leak and Boris Cherny had the following to say..

"Mistakes happen. As a team, the important thing is to recognize it’s never an individuals’s fault — it’s the process, the culture, or the infra.

In this case, there was a manual deploy step that should have been better automated. Our team has made a few improvements to the automation for next time, a couple more on the way."

When complex systems fail often there is more than one thing that went wrong. Uncovering what those things are is important, so that you can address them and prevent them from happening again. Once fixed, it is on to the next task and no need to dwell on the past.