When we add users to our portal we also have to create a password for them. Sometimes we create many users and we also have to create as many passwords.
To ensure that users change their password at first login, it would be practical to have an option that provides this functionality.
Furhtermore it would be super practical not to have to create a password in the first place. Instead the user has to create a password himself at first login. There is a option with ArcGIS Online when users are invited by email.