Whilst I agree that this is an annoyance and can form bad habits in users (as another comment pointed out), in modern macOS systems, what you’re actually being

Whilst I agree that this is an annoyance and can form bad habits in users (as another comment pointed out), in modern macOS systems, what you’re actually being asked for is the credentials of the “volume owner” to perform a change to the sealed system volume. This is indicated in the dialog, but agree that it could be clearer and less jarring.