Is there anybody from 2007 still working at Facebook desperately scared they'll be found out for not being good at algorithms or are these people all in management now? ;)
The way that technical learning works... if they aren't stubborn (and probably fired because of it) then they've likely adapted. Developers grow in knowledge over time as they hone their craft and every senior dev can easily call up some terrible crap they wrote when just getting started.
It's also likely that even at the time the devs working on this wanted to start refactoring more - it's one thing to recognize bad code, having the muscle within a company to allocate resources to fixing that code is a different matter.
It's also likely that even at the time the devs working on this wanted to start refactoring more - it's one thing to recognize bad code, having the muscle within a company to allocate resources to fixing that code is a different matter.