Teachers don't have any access to a student email list if the messaging system is turned off (have to copy and paste one by one from the roster).  Getting to a parent list requires running a roster report.  The "Send Communication to" button stays even when group messaging is off, and it just gives you the email addresses to copy and paste.  Having this button remain even if the system is all the way off would be OUTSTANDING!  Teachers need access to this information even more when the messaging system is off - especially if they are a G Suite for Education school.  PLEASE implement this.  It would be a life saver.