All users of the AR module who import contacts to the client record would benefit.
Through NXT and/or the Database view.
https://kb.blackbaud.com/articles/Article/48033 In this article it states that it's only possible to import a new instance of an address through import and make it the new primary. It is not currently possible to import a change to an existing vendor or in this case client address. My apologies for any issues that this may be causing. Due to the nature of this request and action and the value that I see that this can give to other users in Financial Edge; I would recommend sending feedback through our Idea portal.