Just my two cents, but while ZD in the past has had a lot of problems with people posting for the sake of farming a post count, I don't really see that as a prevalent issue anymore due to how message boards have evolved over time. Most sites where people post anymore don't keep a post count at all so it's less within internet culture to be posting for the sake of an arbitrary post count. I think that's reflected in the general attitude here on ZD as well, and us having chill threads for chitchat like toym, people aren't really posting in there for a post count so much as to just chat informally with community members and such. In that sense, I don't really see there being an issue in enabling post counts for these sections currently not being counted, since of course, forum games and mafia are equally interactive with the community in the way many general discussion/chit chat threads are.
I don't really think the numbers matter either way though; I think selective counting for the activity ranks at least is probably fine and makes sense as far as like substantial posting goes, but I don't think its necessarily a forbidden consideration to enable the counts in these other sections. Or as inversely proposed, disabling counts the chitchat boards/threads. Again, it's just numbers; I don't think most people really pay attention to what anyone's post count is anymore for this change to matter all that much, but when you consider the post count as a gauge for community involvement as mentioned a few times above, then I can understand the sentiment that there is an inconsistency in what "community involvement" means.
I'm not really for or against the change, but the attitude about post count isn't necessarily the same as it was when those restrictions were set in place.