In summary, it sounds like Apple made the right design decisions. Weight and stability over lightness and the wobblies. Still, this new very heavy keyboard makes a 12.9” iPad with an attached keyboard about the same weight as a MacBook Air.
Now that Apple seems to be pushing down on the gas to make the iPad a legitimate laptop replacement, they need to add a second camera along the side (so it is on top when in landscape attached to this keyboard).
I ordered one for my 12.9” iPad Pro, and it’s on the way. I’ve been using the big iPad a lot since being housebound and I can’t wait to gives it a spin.