ARM templates are the native automation mechanism for the Azure cloud platform. It is possible to execute ARM templates from Terraform using resource azurerm_resource_group_template_deployment. To Azure professionals with less Terraform experience, this is appealing.  It allows them to use their existing skills and provides some short-term productivity gains. While I see the benefit, the tactic eliminates some of the benefits of using Terraform. 

Don't use Terraform to run ARM templates unless y...