I've found DropBox's zxcvbn system to be ideal. Instead of requiring passwords to fit a set of arcane rules, it requires passwords to meet a threshold of entrop

I've found DropBox's zxcvbn system to be ideal. Instead of requiring passwords to fit a set of arcane rules, it requires passwords to meet a threshold of entropy. Is there a reason this isn't more widespread? https://blogs.dropbox.com/tech/2012/04/zxcvbn-realistic-password-strength-estimation/ https://blogs.dropbox.com/tech/2012/04/zxcvbn-realistic-pass...