enterprise users can be given access to multiple schemas and databases without having to create an account or schema in each database.

The statement is false. Enterprise users in Oracle DO require database accounts and schema creation in each database they need to access. Enterprise User Security (EUS) provides centralized user management across databases, but each database must still have a schema/user account mapped to the enterprise user. The enterprise user is authenticated centrally (often through LDAP/directory), but authorization (schema access, privileges) requires database-level schema objects. There's no magic way to bypass the need for database accounts entirely.