It is standardized and documented if you DO document it and properly use IaC like CloudFormation or Terraform. But you can absolutely have people do ad-hoc chan

It is standardized and documented if you DO document it and properly use IaC like CloudFormation or Terraform. But you can absolutely have people do ad-hoc changes in AWS that are not gonna be reproducible. Also, all of your points apply to non-cloud systems too.