For the sake of documenting the official response for later visitors, the reasoning behind the decline appears to be Jeff's comment on Pekka's answerJeff's comment on Pekka's answer:
there's no valid case for "I need to notify a large number of people" -- at least not one I will support by writing software for it. – Jeff Atwood♦
By "large number of people" Jeff apparently means 3+, as 2 is the current max (and one of them must be the post owner).