I have done some tests, Cybran frigate spam will always defeat Aeon spam, for reasons:
1.7 Aeon frigates cost 2050 mass versus 8 Cybran frigates 2000 mass.
2. During the approach, 50% of the guns at Aeon does not fire. In a defensive situation, when they start firing earlier and after the first volley they deploy the ship in order to fire from their two guns, they are still much inferior in general dps, a slight advantage in range does not help them.
3. Aeon frigates have less hp.
If you add an equal number of submarines for both sides to the battle, the Aeon submarines will win the underwater battle thanks to the torpedo protection of the Aeon frigates and will be able to drive away the enemy frigates.
In addition, the Aeon frigates do not have AA, which to a certain extent forces them to build special anti-aircraft ships, spending additional mass, but I have never seen anyone build them.
Since in equal economic conditions (Aeon versus Cybran) it is almost impossible to win the t1 war on water, the general conclusion makes sense to build only t1 submarines so as not to lose on t1, but how events will develop when switching to t2 without the support of frigates, I'm not sure.
Aurora and Fervor seem to be in balance.
I think you are forgetting that cybran has stealth