I wrote documentation for software that replaced set rules with a library that would determine the 'strength' of a password and only accept strong passwords. My

I wrote documentation for software that replaced set rules with a library that would determine the 'strength' of a password and only accept strong passwords. My feedback was 'this is bullshit, I've have 40 passwords rejected and I don't know why. How is the non-technical user supposed to pick a password when the rules and tests are secret and the doc person themselves can't use it?'