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That depends on what you are referring to.

If by PULUMI you mean the <https://www.pulumi.com/registry/packages/azure-native/|azure-native provider>, then it is entirely possible. Not certain about Azure, but the native providers I have used are all relatively new compared to the terraform-based providers, and sometimes have bugs or missing features. However, it seems that this particular native provider may be pretty up-to-date based on their docs.

If by ARM you mean specifically Microsoft’s Azure Resource Manager, then it seems likely they are going to be most up-to-date on things since it is literally created by MSFT.  Otherwise, you might be referring to the azure classic pulumi provider, which provisions resources using ARM APIs <https://www.pulumi.com/registry/packages/azure/|doc link>

all of the arm templates should be mapped to azure native resources

And why i cant create an Azure Flexible Database with Azure Native ?

<https://docs.microsoft.com/en-us/azure/templates/microsoft.dbforpostgresql/2021-06-01/flexibleservers?pivots=deployment-language-arm-template>