Yes and no. If someone is attacking you personally, yes. If someone attacks a group that includes you, breaks one of your passwords, and posts a dump on the i

Yes and no. If someone is attacking you personally, yes. If someone attacks a group that includes you, breaks one of your passwords, and posts a dump on the internet, yes. But if someone gets some password database, bruteforces all the passwords under 20 characters, and now has a username-to-password map with a million entries.... you're probably safe from that attacker using your username/password on other services. So I'd say that it's better than "marginal". So it depends on what attack scenario you're defending against. Which is true for all safety judgements.