

You don’t even need to go at a low level. Lots of programmers forget that their applications are not running in a piece of paper in general.
My team at work once had an app running Kubernetes and it had a memory leak, so its pod would get terminated every few hours. Since there were multiple pods, this had effectively no effect on the clients.
The app in question was otherwise “done”, there were no new features needed, and we hadn’t seen another bug in years.
When we transferred the ownership of the app to another team, they insisted on finding and fixing the memory leak. They spent almost one month to find the leak and refactor the app. The practical effect was none - in fact due to the normal pod scheduling they didn’t even buy that much lifetime to each individual pod.
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