This was a good read but really if you already follow the common best practices of IAC/terraform/aws multi-account I don't think you're going to learn much.
The comments in here kind of made me think I was going to hop in and take away some huge wins I hadn't considered. But I have been working with Terraform and AWS for a very long time.
If you're unfamiliar with AWS multi-account best practices this is a good read.
https://aws.amazon.com/organizations/getting-started/best-pr...