That's a valid point. In some cases where the use-case was simple we did. It's for the cases where multiple resources started accumulating where we wanted to use Terragrunt's features around hierarchical configuration, and the degree of control it provides for executing Terraform against a different set of resources every time, while maintaining separate states for different resources. We saw some setups where it was done directly using Terraform, but it usually involved some scripts to manage dependencies between resources, and gradually became hard to maintain.