With the current, empty defaults, we leave it to site operators to adjust auto-generated message handling in Discourse.
I for one do not accept auto-generated messages in my Discourse sites. 
This sounds like an interesting use-case, but not one that I know of; perhaps we just need better messaging/notifications around certain actions… although I presumed admin users are notified about updates (I know I am!), and non-admin users would not be able to do anything with an “update available” message…? 
I’m sure a Contribute > Feature topic explaining the situation would be appreciated. 