Difference between config in administration mode and expert mode

Hi,

We can make changes to FPM-based component configuration via administration mode (SE80, menu bar Web Dynpro Configuration > test > Execute in Administration Mode) or expert mode (user parameter FPM_CONFIG_EXPERT = X), to, for example, add a new tab (main view) to a sap standard application (after enhancing the sap std component config).

I understand that in expert mode any changes are regarded by the system as modifications (as opposed to customisation with administration mode) and hence these modifications could be overwritten by future support pack application.  Correct?

Is there any advantage to using expert mode over administration mode, given that expert mode config could be overwritten?

Thanks in advance,

JP.