You're right that more attempts means more chances at failure, but I don't think it's a 1-to-1 relationship. It's when I don't perform a task for a few years t

You're right that more attempts means more chances at failure, but I don't think it's a 1-to-1 relationship. It's when I don't perform a task for a few years that I tend to make mistakes. Even if it's not an automated process (which I think this encourages), then it's easier to keep your skills sharpened by doing something more often. Would Mozilla have accidentally forgotten to renew their browser certificate recently if it were a more frequent task? It's hard to say, but I think it's likely there'd be a stronger procedure in place. There would need to be.