Not sure about that. It’s a clever trick alright but it adds a possibly unnecessary layer of leaky abstraction and makes code reuse more difficult when working

Not sure about that. It’s a clever trick alright but it adds a possibly unnecessary layer of leaky abstraction and makes code reuse more difficult when working with “vanilla” Terraform. If you really want to use a full programming language with infra as code, I’d suggest looking into Pulumi. Or, if you want to (or need to) stick to Terraform, try the official CDK.