
If you're only using D365 as a service, the Landing Zone might not be necessary. D365 is a SaaS (Software as a Service) offering, meaning Microsoft manages the underlying infrastructure for you.
Your current setup could be sufficient if you're not hosting additional workloads or custom applications in Azure.
But if you're integrating D365 with other Azure services, for example, using Azure for custom apps, data analytics, or other workloads, a Landing Zone can help ensure proper governance, security, and scalability across your Azure environment.