The fender grab/hook in Trials Rising.
If you look at this clip from the RL stream, you can see iBlubbi attempting to land a few fender grabs with the Mantis... But they don't seem to work as well as they did in previous games. In Rising, the fender grab seems highly unreliable and inconsistent. It feels as if it's too solid to get stuck on the ledges.
Personally, it doesn't bother me all that much, but I've read quite a lot of concerns from fellow ninja players about it.
If you guys can answer that question, is there any chance that the fender grab will be tweaked in the future? Or is it something you can't change without causing other physics-related issues?