It's the lack of the track bar along with the elimination of the inherent bind amongst the links. And the difference between a 3/4 link and stock-ish is fairly minor. I am one of the people Blaine was referring to who was aware of it, noticed it, and likely made it more prominent than it should have been. Like a lot of things in my build progression over the years, perspective has changed many things in hindsight. Especially once I started being able to make some of the more interesting changes that had really dramatic effects.