You mean why count local users and local posts? Well it would be impossible to count a total number of posts from several pods if we only knew how many posts in total, so local posts is the thing that imho is important. Depends of course what one is interested in, but counting all posts doesn't say anything how many posts this pod has made, it only says how popular other pod users are on this pod.

I can also put local_posts to a separate method if wanted.