Building abilities usualy fade when labs are gone tho. Repair bays don't repair anymore superweapons won't fire anymore. I'm surprised RA still works.
Flipkik, No, repair DO still repair after the lab requirement is gone. You just can't build anymore. But yeah, superweapons won't fire.
I think automatic features continue to work, while those that require user input don't. For example, you can no longer order new ships, after that research has been lost, but the ships still work.
And the second level of RA IS actually a significant discount. I've heard about a 40% discount. But the biggest savings that people forget about is: you get high tech ships like HC's, (or Carriers) even if you don't do the research for them. Unfortunately, you don't get Overseers or Subverters.
Valkya, RA has been this way for as long as I remember. There are a few other useful Techs that you can also get, then scuttle the "extra" labs, and still use the Tech. Like Pervasive Economy for TEC, under the civil tree (tier 8).