Thank you for saying this. The overwhelming majority of comments on this thread are pedestrian - as if FBs engineers have been making decisions out of naivety, incompetence or self interest.
It might look that way in hindsight, but hindsight is easy. As is armchair theorizing about the competence of other developers.
Most people (including myself) will probably never see a >500K loc application or a project with >100 developers working on it. Biggest ones I've worked with had around 30-50 odd developers?
