The first AoE Leader Optimus Prime is very much a backpackformer, but the second AoE Leader Optimus Prime does a better job in distributing more of the chassis along the shoulders and hips, using the panels to form the robot's armour. It's still got a backpack but it's significantly smaller than the first Leader. The second Leader Class Prime is probably as good as they can make a toy based on the ridiculous screen design which has most of Optimus Prime's truck mode being magically swallowed up into his lower back.
This FK Optimus Prime seems to be not much better than the first Leader Optimus Prime with much of the chassis on the back, and the back of the cab in the truck mode looks a bit odd. But it's probably as good as they could make it at a Voyager size and price point (again, it's no worse than AoE Voyager Galvatron). Ultimately I think that many of the AoE (and likely FK) toys are being hindered by the current kibble-free screen designs which are counter intuitive to being adapted into toys. Short of giving them a Masterpiece budget which would make these toys too expensive for the primary demographic market.