Need the ability to update/change the Marketing data configuration settings that are synced/published to the backend service.

E.g. in the OOB box configuration, there are entities that cannot be turned off, e.g. Attendee Pass, Forms Pro etc, and others that may change over time. These entities may not be used by some customers so we should be able to remove them.

Ideally the ability to choose specific attributes/fields would be even better.

The reason is primarily to simplify the user experience. There are a significant number entities and fields seen in the Segment Builder and Email Designer/Assist Editor that causes a lot of confusion; particularly for non-technical marketing users. Most fields will never be used for marketing or segmenting purposes so why have them available for selecting.