The problem is that most have adopted password managers and two-factor, which means the guideline will be largely ignored.
In my experience, the vast majority of everybody is still bumbling ahead with post-it notes and simple, memorised passwords shared all across the board.
The vast majority of people don't use password managers (or 2FA).
[0] https://www.internetsociety.org/sites/default/files/08%20why...
[1] https://www.passwordboss.com/news/survey-finds-vast-majority...