You caught me because I didn't read the article. I was just thinking of the old duality between bugs and features. An unimplemented feature is just the bug "the

You caught me because I didn't read the article. I was just thinking of the old duality between bugs and features. An unimplemented feature is just the bug "the software doesn't have this feature yet", and a bug fix is implementing the feature that "the software should do this correct thing instead of that buggy thing". Since this insight is decades old, maybe I should switch to saying the article contains nothing new?