These are required parameters for create methods. Are they being passed to those methods directly as well?

These parameters are passed directly to the service methods.

This Properties object is based on how the service Swagger groups parameters, however, I believe we certainly could change the method signature to take all required values like this:

public Mono<KeyVaultRoleAssignment> createRoleAssignment(
    KeyVaultRoleAssignmentScope roleScope,
    String roleDefinitionId,
    String principalId)

Instead of what we have today:

public Mono<KeyVaultRoleAssignment> createRoleAssignment(
    KeyVaultRoleAssignmentScope scope,
    KeyVaultRoleAssignmentProperties properties)

What do you think @heaths?

I thought we were doing it that way in .NET after a discussion, but I don't see that in source. @christothes and @sadasant, was it a different method we were talking about pulling roleDefinitionId and principalId out of, or was that for the model constructor? I may just be remembering wrong here.

I think we still use a properties bag in .NET, but I like the individual parameter shape better.