Well, no: Cordelia's scenes w/Mehta in the first book, Bel's commentary (as a herm!) that Beta Colony is not terribly friendly to people who won't fit into the tidy little boxes, Mark's demonstrations throughout the books of Beta's without-peer psycho-wossname abilities.. if you take any one book, no, you won't get: hey! here's a socialalist/SoCal Instrumentality. But taken as a whole, it's there. The immigration policy is specifically addressed by (if I'm remembering the name right) Enrique (the fellow who ends up with Marta Koudelka). He doesn't put it in so many words: Beta Colony doesn't need kids! It can get all the fresh blood it wants because the Enrique's of the Nexus are all panting for the opportunity to emigrate there. But he does impart the info.

Sorry my friend--I've probably re-read the series too often--I'll grant you your point on any individual title. But Ms. Bujold has stated that the Nexus books are meant to work on two levels: to contain enough "fun" and info to enjoy each individual story on it's own, but to also exist as a self-contained whole which will be greater than the sum of its parts.