> This also seems to discourage passphrases because even though any good passphrase (such as "correct horse battery staple") will get 5 checks easily, you have to get through a lot of Xs to get to those checks, each one suggesting that what you are doing isn't a good idea.

Do you mean that you think that passphrases aren't actually a good idea? Or do you just mean that the tool might make someone think that they're not a good idea?