What are you seeing

When working on integration tests with mongodb::server::create_admin=true I noticed prefetch of databases failed.
The error was fixed in the provider, but it bot me thinking 'why do we manage the admin database end not just the admin user?'

I have tried to bring up mogodb 4.4 trough 7.0 without auth, and it seems the admin database is always there.
Given this there should be no reason to manage the database with puppet.