If passphrases are easier to remember, then it may be possible for a human to be able to recall many such passphrases at the same time. If these passphrases are

If passphrases are easier to remember, then it may be possible for a human to be able to recall many such passphrases at the same time. If these passphrases are used for services with any sort of auth rate-limiting, and they aren't reused between services, then the difficulty of reversing their hashes isn't really a problem.