I thought the main changes for next year were
1) no more F duct
2) reintroduction of Kers (don’t know if it’s optional for teams)
3) driver adjustable rear wing if following someone
I can see the point of 2 from a technology POV but not sure about 3.
What I can’t understand is why they design a new track where overtaking is very difficult (as per the weekend). I don’t want to see endless swapping of positions but at least give them a chance !!!