It appears that when using "simple permissions" a user is unable to create a subpage under an existing page *unless* they also have edit permissions on the parent page?

I receive the message "You do not have permissions to add a page of this type in the selected location".

I would like to have a master list of blog articles and allow certain users to post a blog article underneath, but this doesn't seem possible with "simple permissions" without also allowing edit access to the main page. Is that by design? Or is that a bug?

(See screenshot.)