FIM/MIM Question - using Metadirectory for applications or queries?

I'm new to understanding FIM or MIM. 

Looking over the architecture, I'm curious as to what real world scenario is used in terms of utilizing this data.

Say in the synchronization service, the metaverse collects for an identity "John Doe" that from AD, their employee # is 123456. Then from an HRIS database, that John Doe's personal address is 123 Microsoft Rd.

then if we have a tool that queries this information, such as something like a password reset tools that requires verification of that info, do you connect that tool to the FIM/MIM Metaverse directly like like an LDAP query? 

Is Powershell able to query the metaverse database of the aggregated data collected? 

Or would you just have it to an export to a secure database like ADLDS and query it?