The best practices to support UC's new package development strategy are to test developed packages in test environments before installing to production, and to consult the metadata coverage report to identify features supported by packages. Testing packages in test environments can help to ensure the quality and functionality of the packages, as well as to identify and resolve any issues or dependencies before deploying to production.
Consulting the metadata coverage report can help to determine which features can be included in packages, and which ones need to be deployed using other methods. Version control still needs to be used, as packages do not manage all the code and configuration, but only the components that are part of the package. Moving everything in the existing codebase to a single monolithic package is not a good practice, as it reduces the modularity, maintainability, and reusability of the code. It is better to create smaller packages that are focused on specific features or functionalities.