Benefit to Hiding Local Drive?

Our user base has local admin privileges but we have hidden the C drive. This was done to 'protect' important system files. We have also used GPO to restrict these users access to Administrative tools. 

This leads to 95% of our users getting tripped up when attempting to save or open work. Instead we advise they save to a network share, only available inside the building; or a flash drive.

I'm aware I can use GPO to instruct Office to automatically save to a specific location, but this does not address other programs.

I feel we're practicing security through obscurity, as they can clearly read/write but cannot view the C drive.

Is there any real tangible benefit to hiding the C drive(including My Documents, etc?)

Thanks!