A data engineering team is setting up development, testing, and production environments for a new data pipeline migration. The team needs thorough testing of both code and resulting data, aiming to use data closely resembling production data.

A junior data engineer proposes mounting production data directly to development and testing environments, allowing pre-production code to run against production data. Since all users have admin access in the development environment, the junior engineer offers to configure permissions and mount the data for the team.

Which statement reflects the most appropriate best practice in this scenario?