In software such as D2L, (frequently used in education) there is an option for teachers to view the website as a student. This can be very useful for a teacher to emulate what the student can see. The same holds true for administrators in AGOL and Portal. It would be a great benefit to be able to swap between roles/user types to see what the experience is like for different users. I would use it to assist staff that do not have the same permissions as I do.