It’s true. For social accounts, it’s great to have one account, for everything communication related, and works between the various clients. Yes, losing it, people can see your DMs.

For other use cases, there’s no harm using a new key. For example, you can use a different key for highlighter, to keep notes. Another key for listr, to keep list of items. Another key for password manager like this, to keep passwords.

And for this password manager, leaking your key still keeps your data safe, it’s using similar encryption to other password managers to encrypt your data the second time.