As an aside, I was an employee around then and I vividly remember that the next half there was a topline goal to improve web speed. Hmmmm, I wonder what could have happened?
That’s one of my favorites. The exact bug they described during React launch presentation, that React was supposed to help fix with the unidirectional dataflow. You know the one where unread message badges were showing up inconsistently in the UI in different places. They never managed to fix that bug in the 10 years since React was announced and I eventually left Facebook for good.