Instead of connecting Gainsight to Microsoft Dynamics 365 using user logins, it would be easier to maintain our connections if we could use registered apps to connect Gainsight with Dynamics 365. Then we would not be reliant on a single user who has to maintain the connection, when this person could be out of town or otherwise unavailable.
In addition, registered apps are more secure, and this is the direction the Microsoft community is moving, encouraging IT personnel to authenticate using registered apps instead of using user logins.