I do like the idea of having a wider range of gears, however it is not worth the weight trade off for me. Where are you getting that the weight is at the center of rotation vs the edge though? Just slightly less weight from bolts on the chainrings?
Also not sure what you mean by more/less leverage, I should be able to get that by just using a shorter crank arm unless you mean something else or I am not reading it correctly.
Ultimately I do like what they are doing with having a 13 speed group but the trade off of not being able to easily change out you chainrings depending on where you are riding is a bit much for me along with having to send it back when you need new ones. I am disappointed in this release as I was hoping for it to basically be old etap with 13 speeds and a weight decrease.
EDIT: I am challenged, 12 speed it is.