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Hmm, everything should be in parallel by default unless there are dependencies.

That was my assumption. I'll test one / two more times. It might've been a fluke. Maybe. The Azure APIs are a bit "slow" today.

I've had more of a problem with contention within Azure when deploying VPN Gateway, ExpressRoute Gateway and Azure Firewall at the same time as trying to associate subnets and route tables. So I have been experimenting with introducing dependencies in order to reduce contention.

I have found that strategically adding depends_on prevents all the retryable errors I was seeing previously in Azure Activity Log e.g. gateways and firewalls depends_on both the gateway and firewall subnet, and other subnets depends_on gateways and firewalls. Without this contention I have 50 odd resources deploy in less than half an hour - times out otherwise