Pages Quota not disabling the ability to create a new page…

I’ve tested this for the first time tonight and made note that the Pages Quota doesn’t work as expected. It doesn’t allow a user to publish a new page, but they can still create one (it sets it as a Draft). Their also is no notice advising a visitor they need to upgrade to create (or publish) additional pages (I do however see an upgrade notice under the Media Library upload about increasing storage space).

Why does it not completely disable the ability to create pages and why does it not display a notice to upgrade? I suspect this will cause significant confusion with my users.