> and then has been ignored They're not ignored, most are just not feasible in production due to both performance and memory overhead. They're still used for

> and then has been ignored They're not ignored, most are just not feasible in production due to both performance and memory overhead. They're still used for tests to check for issues (valgrind?) If you can point to something that actually works properly in production without much overhead I'd use it in a heartbeat. Also, I'd say proper logs are a form of time traveling debugging... so a system built on logs might work :)