I agree, Advisor doesn't provide security recommendations

First should be No.

Azure Advisor provides you with a consistent, consolidated view of recommendations for all your Azure resources. It integrates with Azure Security Center to bring you security recommendations. You can get security recommendations from the Security tab on the Advisor dashboard. Examples of recommendations include restricting access to virtual machines by configuring Network Security Groups, enabling storage encryption, installing vulnerability assessment solutions.
However, Azure Advisor does not provide recommendations on how to improve the security of an Azure AD environment.