If you change something in the software-properties or do a manual "check for updates" in update-manager, you would have to enter your password too. So I don't think that is so inconsitent.
** Changed in: gnome-app-install (Ubuntu)
Status: Unconfirmed => Confirmed
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Gnome-app-install requires sudo to update repository listings
https://launchpad.net/bugs/64714
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