I see what you are saying but that would require a lot of changes because if we add logic to set the roles to only admins when nothing else is checked, then Content Administrators would need to always be checked in order for content admins to have access whereas currently Content Admins can edit anything without having their role explicitly checked as allowed.

It sounds like "would require a lot of changes" is the primary reason and I would certainly be more than willing to submit a patch. I understand that having put in place WebUser.IsAdminOrContentAdmin  or '== "Admins;")' all over the source makes it a bit cumbersome to modify, but it would simplify the UI and that's all that matters at the end of the day.

You could have a couple queries in the update script to modify the database to reflect the way new UI works by checking which EditRoles are null or empty and setting those "Admins; Content Administrators;".  Your last point will be addressed since the update script will convert all null/empty  view/edit roles to  "Admins;Content Administrators;" and if the user DID want an Admin only scenario, they would have to uncheck "Content Administrators" or whatever other roles they had checked, so it would require them to perform an action and would not happen accidently. 

Speaking of accidently, the reason we ran into Admin only scenario was because those "Administrators" checkboxes were being checked by default due to the logic in PageSettings.aspx.cs and thus every time "Content Administrator" modified page settings, they would automatically lock themselves out of the page by creating an Admin Only scenario since the "Content Administrators" checkbox was not checked either.

Just trying to improve the overall product for the end user here, that's all.

In my opinion, the fewer UI elements the user has to deal with, the better.  Taking Admin and Content roles out will also spare you from having to answer questions like "How come I unchecked Content Administrator/Administrator box, but he/she can still view it?"  Because there certainly will be people that will try to create sections of the site for which they wouldn't even want Administrators to have access to. Any scenario is possible at the enterprise level.

Thank you for all of your hard work and patience.