When you someone performs surgery on one patient, the legacy medical impacts of that surgery are contained to at most 2 people and their immediate families. The

When you someone performs surgery on one patient, the legacy medical impacts of that surgery are contained to at most 2 people and their immediate families. There will probably be fewer than 10 surgeries where someone might think about that -- and we don't begrudge a surgeon who doesn't. When you add a commit to an OS, the legacy impact of that stays with the OS and must be un-done by anyone who changes it.