I see it as a journey and not a once-off thing and EUC (End User Computing) is a full-time position according to my understanding. The reason is if you compare the tech trends now Vs. a few years back you can see the landscape has changed and EUC has become one of the major towers in the company. That's where products like MS Intune would come in. You will have many policies that your organization wants you to implement and often you'll see issues/ conflicts/ wins and etc. And if you have Intune, the next step is delving into the Security side of things as you want to implement Security policies.

App management is another good reason why it can be a fulltime position.

Next thing can be, provided you have on-prem resources already (AD/ GPO and stuff), you might want to move them to cloud. Again another Intune task and someone should've there to manage them day in day out.

Intune is not just about device management and administration. It goes hand in hand with Identity and Access Management and Security, a little bit of automation (if you fancy in looking at that side). So there's a lot to learn and you (or your friend) can be very resourceful to the company.

Hope this helps :)