I dont understand why would i prefer Object Library over Asset Registry?

I dont understand. Why do i need Object Libraries? I can group my assets using folders, why do i need libraries?

I have read the article: https://docs.unrealengine.com/latest/INT/Programming/Assets/AsyncLoading/index.html and still dont understand.

Ok i think i become understanding.

  1. Object Library can contain perfected list of needed assets for some needs. While folder usually not used like that.

  2. Object Library’s assets can be replaced without needing to change any references. Acts like proxy for assets.