I hate scaling in RPGs for general mobs, it pretty much voids the idea that your character has grown over the course of the story when the entire rest of the world progresses at the same pace while sitting at home and doing nothing.
That said certain things should scale. For example they're talking about competing adventure groups, it makes perfect sense that they should scale to some extent as they themselves are adventuring.
So in general very much against scaling but it's something that can be intelligently applied to situations that make sense. If when thinking in terms of the world and from my character's perspective I can understand why something has scaled and gotten better then it's fine, if it doesn't make sense in context of the world then it's bad.