To my eyes, this change is obviously a method by which to legitimize the moderation of shit-posting.
There have been several users lately who have spammed the forum with things like "and what's up with this?" or "could this have been a parclo?" or similar dross. Then there are those of us (myself included) who occasionally like to channel our inner NE2 and post something like "wut" or "no". Over the last few years, we forum members have seemed to grow more capable of self-moderating when the discussion starts to turn to politics or religion or whatever, more capable of just keeping our mouth shut to avoid a flame war and purple text. But, when it comes to shit-posting, we either (a) are a user who doesn't even realize he's doing it or (b) can't control ourselves. When it comes to up-votes and snarky one-word replies, no new content is generated but at least the damage is contained. When it comes to posting a dozen dumb questions, though, everybody tastes the Spam.
While I support the moderation of things like excessive profanity, off-topic fighting, personal attacks, etc—things that make the forum an unwelcoming place—I do hesitate to support the moderation of content quality. (Unlike HB, I see moderation of the forum w/r/t the former as being more akin to a store manager confronting rude customers, less like the government restricting citizen behavior.) In general, the longer members hang out on the forum, the better their content gets. But the problems I outlined above may not be self-correctable.
So where does this leave me? In my opinion, this is an unfortunate but necessary turn of events. I also trust that the moderators will not use a heavy hand, or else members who might be in jeopardy would already have been warned even without the new restrictions.
Edited to remove replies to deleted posts. -S.