They make up for not having government techs by having +45% economic bonuses from their economy tree (DA economy tree is 15% whereas governments are 10%/20%/30% when active), although they still rely on tech trading to get a spammable economic building.
What this means to you is that you don't have to keep approval as high. 
Incidentally, they're also missing Core Detonation and Tidal Disruption.
If you want to see a race that's missing something, try the Arceans. No engines outside of hyperdrive, and in what seems like a bug, they get Majesty, but not Total Majesty (so no Spin Control Center).
There are holes in every tree...with the exception of the Terran tree, really, which doesn't so much have holes as not get the unique benefits that the other trees do. (Note: I've complained about this, but it hasn't done any good. I am however becoming more partial to the Torian tree, for whatever that's worth.)
