(And before you say: no, the codebase doesn't take a quality hit. Turns out that this ceremony around writing code is just unnecessary, contrary to population opinion.)
Which part of the codebase? Facebook's back-end systems do a very impressive job given the scale involved. On the other hand, its front-end systems appear to be mediocre in most important respects. A business without Facebook's advantages that wrote a UI as slow and buggy as Facebook's main or advertiser UIs often are could be in serious trouble.
Which part of the codebase? Facebook's back-end systems do a very impressive job given the scale involved. On the other hand, its front-end systems appear to be mediocre in most important respects. A business without Facebook's advantages that wrote a UI as slow and buggy as Facebook's main or advertiser UIs often are could be in serious trouble.