For what I need call USceneComponent::SetupAttachment in Actor class?

Development Programming & Scripting
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1

Hello!
When I create an inherited class of APawn, I had add UStaticMeshComponent* MeshComponent against of SceneComponent to properties. In constructor of the class I called:

SceneComponent = CreateDefaultSubobject<USceneComponent>("SceneComponent");
SetRootComponent(SceneComponent);

MeshComponent = CreateDefaultSubobject<UStaticMeshComponent>("MeshComponent");

As you see, I did not call MeshComponent->SetupAttachment(SceneComponent);

Then I run project editor (F5), created BluePrint from my C++ class, and I see that the MeshComponent already attached to the SceneComponent:

Components ierarhy:

Scene Component (SceneComponent) (Inherited)
  Mesh Component (MeshComponent) (Inherited)

So for what I needed to call the
USceneComponent::SetupAttachment ?

Regards, Andrew