All this nerf really did was nerf the TEC. Novas can't win you the game and never have been able to. Engines just need some love.
Kosturas though.. As a Vasari player, I can safely say that I don't need more than four. Ever. Yeah, in some 5-7 hour games with hundreds of planets, I'll just start spamming them because I occupy four systems and my enemy has one just because I can, but still.. In any normal game, Kosturas are for strategic attack against undefended worlds.
Basically, what this nerf will do to the weapons is this..
Novalith: super nerf, denying it's ability to spam the enemy and reduce tax income of enemy worlds.
Deliverance Engine: this thing just needs some love, or at least that's what I keep hearing from Advent players. I don't play Advent enough to know how this will impact things.
Kostura Cannon: all this does is make the weapon be used for guerrilla war instead of artillery which was it's intended purpose.
The DE and KC don't need to be artillery. They are tactical weapons to for modifying the field of battle. The Novalith on the other hand doesn't work like that. It is planetary artillery and without masses of it, it's not really going to do anything...