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It really depends on your cloud; I recently worked with an openstack setup where I needed to create some 6 resources per compute instance, with ~200 instances that’s a whole lot of resource blocks to manage — hiding al that in a module abd passing in a dict of machines to create was imo the right choice..

I use a domain driven design (ddd) approach with terraform where different business domains and subdomains are isolated by modules. For example, if an application handles photo uploads and image processing, that would be in its own module.

I use modules to import serverless deployments as "data" blocks.