At the moment with system delivered fields all I can control is whether or not they are included in a People Category. However, for Custom Fields I can determine what Access Permissions can see them.
Not sure if this would be of value for anyone else but for us it would be great to be able to control what fields access permissions can see for not only Custom Fields but also for System Delivered fields.
Is this something that could be explored?
I'll pass it on to be considered. I can see how making certain default fields locked down could be beneficial in certain circumstances - which fields in particular where you thinking of?
Let me know!