When something like this happens, I always assume there's some poor engineer who tried to raise the red flag "uh guys this might not work every time live" but nobody listened.

so they might not be shippable yet?

im trying to think of a functional reason why the thick wide square, frames? classic 50's retro?

i could see a patent or trademark on design being a financial item, preventing the sport model, but FB could afford it im sure.