Include user administration in your strategy rather than simply end user task automation.
Looking at the various Graph APIs (i.e. on a per product basis), there's only one that addresses back-end administration, which unsurprisingly is Azure AD.
While Graph is nice for end user task automation, it completely overlooks the mundane but necessary back-end processes. For example, you can use Graph to come up with end user mailbox automation involving calendaring (front end), but you can't change anything about the user's mailbox configuration (back end).
Another example is that you can fiddle around with user (front end) scenarios in Dynamics 365 via Financials, but you can't even add a user (back end) to Dynamics 365 much less add them to security roles and so on.
In short, Graph is currently only useful for developers and brings next to nothing to the table for engineers and architects (particularly in an IDAM context). In my opinion, this is a strategic failure.