Confusion of having spawnable animated skeleton objects

I’m confused of the new content, spawnable animated skeleton objects.

I understand the concept which as user we may create some objects and make them spawnable and instance them into an empty or non-empty scene;
When the spawnable objects or information had instanced to another location, they don’t exist in that location but a mirror.

My question is why does Epic Dev team make such option for us? Are there any advantages of using instanced spawnable information?

I’m currently making 3D Animation using UE4.
How does this new content helps me in its own way?

still waiting for an answer~

would anyone please explain to me ?

thank you

Can you say the same with others words?