I think we all feel this could be the cause. Someone decided they can optimize because less than 5% used this sort order. So they knew they would be uproar, but

I think we all feel this could be the cause. Someone decided they can optimize because less than 5% used this sort order. So they knew they would be uproar, but a small, 5%-ish uproar. And now once someone uploads a video they have to rebuild only two caches (recent and popular), not three.