Scouting is a volunteer organization and as such it should support volunteers at all levels. If a non-leader parent volunteers to head up an activity, they should be able to send messages all Scouts (which automatically includes their Parents). Not all parents are leaders and they shouldn’t need View Profile privileges for every Scout in order to send messages to the unit. A large part of messaging via Scoutbook is to ensure 2 deep communications while still providing a level of privacy for Scouts profile information.
Limiting access to this feature encourages the use of non-compliant messaging solutions and defeats one of the core purposes of Scoutbook.
Item #3 and quote from the Scoutbook homepage:
Send messages to leaders, Scouts, and parents
“Combining communications and youth protection in the digital age used to be a huge burden. Now with Scoutbook, all of our unit’s communication automatically follows electronic youth protection without us even worrying about it!” - Scott Fisher, Washington Crossing Council