They should care about the database, because they are going to end up needing to use the thing. They might lock themselves out of important tables and need to start it up in admin override mode. They might need to configure it to allow remote access from certain IP ranges. They might need to do a backup recovery, or do backups at all.
No matter how much they like being a Ruby on Rails developer, the system owner is going to need to deal with the database on a basic level of system admin and should pick one he or she likes.