I don't understand what you are complaining about here. They are warning you that your email address and password might be available to crackers. It then follow

I don't understand what you are complaining about here. They are warning you that your email address and password might be available to crackers. It then follows that if you are concerned about your security, you change these credentials if you have used them anywhere. So it's "bullshit" that they've warned you of this? When you use the same password in multiple sites you are taking the risk that any of those sites could be hacked and your password is put out in the open. CouchDB's security scheme isn't at fault, your personal security scheme is.