An expensive mistake can become worthwhile tuition if it is only paid once.

A costly mistake is only expensive once if you actually extract the lesson. The same error repeated is not tuition, it is a subscription, and the difference lies entirely in whether you looked closely enough to understand what happened. Most people pay and do not collect.

After something costs you significantly, write down what you would need to see next time to catch it earlier. Concretely, as a signal rather than a resolution. Vague intentions do not survive the next version.