Because it's nice to exist outside the news cycle of what's "current" every once in a while :)
I'm guessing most of the difficult moderation would be on the newsy more-controversial posts anyways.
If you don't want to participate in this post, it's OK to skip it. I skip dozens of posts a day - the best part is it's more efficient than going to them and putting the effort to whine!
As for not inviting meaningful discussion: there's some good discussion on this post - the very article you claim isn't capable of generating such.