Responding late, so you might not see this. The thing that was so ridiculous to me was Facebook pretending that their app is somehow orders of magnitude more complicated than everyone else's.

They're whole schtick was "we're Facebook and we have unique scaling needs that no one else does," which makes absolutely no sense from the perspective of one user's content being rendered on their phone.

Plus the presenter was pretty smug, like all of this was good, when he wasn't convincing anyone that it was even necessary.

Found the slides: https://www.columbia.edu/~ng2573/zuggybuggy_is_2scale4ios.pd...

IIRC their iPhone app had about 20000 classes for some insane reason, and the system didn't handle that well.