We have a similar setup: Terraform, and the repository is open to any eng to make pull requests against.

The problem we hit is knowledge: while Terraform is not a huge knowledge hurdle to mount … it is still apparently enough. While good engineers will have no problem picking TF up, … more mediocre ones seem to struggle with it¹.

We don't have a "reference", as things are still changing sufficiently that it isn't clear what a reference would be. (I know sometimes people have base VMs or similar, and write TF about that; we run on k8s, so the various teams essentially don't have to worry about the host VM at all — or at least, much.)

It all comes back to engineering quality, I fear.

¹with knowledge acquisition itself; TF is not particularly unique here. In fact, I'd argue skills in knowledge acquisition is what separates good engineers from not.