Would anybody here be interested in a "mistake postmortem" discussion group? (opens in new tab)

I recently made a dumb (in retrospect) mistake that set me back a lot. Feeling upset and regretful, I spoke to an older family member who reassured me, "yeah, unfortunately there's no way around it; we have to experience these mistakes personally in order to learn from them". I thought, is that actually true? Can't we learn from other people's mistakes? After all, isn't that the whole point of studying history, or listening to other people's advice, etc? I'm sure that every mistake I could po...