Thank you very much @cas !
It seems we can either have performant WiFi (WarpCore) or kmods, but not both.
Unless each of us builds our own firmware as outlined by @Maximilian-Gerhardt http://community.onion.io/topic/2830/building-kernel-modules-for-the-omega2
I don't understand why Onion / @Lazar-Demin does not build all the OpenWrt packages? Is it a time/resources issue or something else?