Ah, hurting brains … sorry. So, post relations will do two things if checked for a specific custom post type …
- It will add an option in the posts publishing section which will control whether the post is featured in the widget
- It will allow posts of that post type that have been categorized into a pressgram category to be controlled by the inclusion/exclusion settings.
These settings are most powerful if a user is using CPTs. Most folks will not need to bother with post relations, too much, as they will only have ‘Post’ as an option.
By default, most home pages display only posts of the type ‘post’. This will allow other post types to be included in the home or rss feed.
Hope that sheds a little light. I agree, there is some clarity needed here. Thanks for pointing that out.