[chad_walters]

From the OP: "Our primary aim with this 'foolishness' is to create a solution that allows us to continue open sourcing parts of our stack without resorting to reinventing some of our internal wheels."

And: "we think C++ developers might find parts of this library interesting in their own right."

I think the key thing is that these are some basic pieces that a lot of FB's internal C++ code depends on. These pieces are being made available as a stepping stone to open sourcing more significant work.