Derek,
The principle of "least privilege" should apply to each and every job role as a basic tenant of security. That being said, it is most effective when coupled with separation of duties. Many organizations, unfortunately don't adhere to least privilege principles and access is coupled with positions (the higher your management position, the more access you are granted). This is, for obvious reasons, the worst security posture, as phishing, spear phishing and whaling are intended to target people with access.
Do you believe that this individual in their role will be granted access beyond their requirement? Or will they be a working manager, where they should be doing the work of the sysadmin along with management?
Another consideration is privilege creep. Take for example, Mary who works in Billing. She has access to Billing systems, data, etc. Mary has taken a new job in credit finance, so now access to those systems are added, but no one clean up her old access. Now she is in a position where she can create fraud because her access violates the company's checks and balances.
I hope that helps.
Kevin
