Migrating to Unity's built-in Caching system

We have developed our custom asset bundle cache. It's pretty basic (simply stores files into a particular folder on the mobile device).

I would like to start using UnityWebRequestAssetBundle.GetAssetBundle which also offers caching.

• What are the benefits of using the built-in cache vs our own implementation? does it offer any improvements in terms of security? memory allocations ? etc
• Is there any simple way to migrate from our cache to Unity's built-in solution ?
• We are not using any hashes or versioning on our asset bundles, is there any option to simply "ignore" this value? will caching still work this way ?