It could also give useful priors for targeted attacks, "Their password is 5 characters, and their daughters name is also 5 characters, let's try variations of that".
Some system accessible to hackers who can see the length of the password /and/ having a single 5 char password has a security of a key under a doormat.
Some system accessible to hackers who can see the length of the password /and/ having a single 5 char password has a security of a key under a doormat.