I don't know enough about the Kessler plate to say, but I highly doubt it. I don't think they would go back down that road.
That too. It's like a machinist said hey I've got an idea, but has to be 100% aluminum and that's final.
Maybe. I haven't inspected my Allflex lately, but I expect to see cracks someday.
Maybe, but the thing about Allflex is that it is a decoupler for the first few mm of travel and then it "locks" and becomes a board flex modifier. The hinges on the ends of the plate crash into the mounts on the board, and the center mechanism runs out of travel. Again, nothing I would have thought to be beneficial, but here we are. You don't need the extra wings or snowstix extending beyond the Allflex plate because that can just be built into the board.