Incorrect. ~jobs is technically the first sub that was added.

Discussion on the next sub has been discussed. The reason there aren't numerous subs now is (from my understanding of it), adding subs may be subtractive instead of additive. Meaning separating content and discussion into subs too early may inhibit the growth like occurs now when the community mashes it all up in this one sub. Jobs was kind of a special purpose offshoot, for now.