What is all the benefits of having static mesh and animated mesh and not just a model?

Hi!
What are the benefits of having static mesh and animated mesh and not just model?

The only difference I see is to have all meshes combined to one mesh and then it's only draw calls by materials.
Also, static mesh doesn't use skinning at all, so having a skinned mesh used on static will result to bind pose only.
So that means the node transformation is not needed for static meaning less memory used.
Is there more?

Is it better recommended to have 2 different asset types or just Model asset and combine at runtime?
Could be …