I appreciate that it's always good to question how much data, of any kind, is exposed, but what's the scenario where you want to share a secret with a specific person, but it's really important that they don't have the email address you use for Bitwarden?

There are alternatives like https://onetimesecret.com which don't, but I can see the value in making it clear that this is a legitimate user to avoid phishing type scenarios.