That's just the tip of the iceberg. My problem is that YAML is not a turing complete language (and dev environments are usually messy by their nature).
Given that YAML it's a configuration language I'd say that not being turing complete it's a feature, not a bug nor a limitation; I always want my language files to be declarative to not suffer the perils of logic.
Edit: Also, I don't see the need for a turing complete language for something like docker compose, if you need something really complex you can always script a docker-compose.yml generator with all the logic and complexity you need.
