What about Aeria Drone Hosts? Can't they spread out pretty well?
They can. But if you're going carrier-heavy, the Stilakus Subverters are not your main problem. Fighters operating from Lasurak Transporters maul Advent Bombers, and Junsurak Sentinels are good too.
If the Vasari are wielding Tier 7 Warfare technology, it is inevitable that their Skarovas Enforcers will be armed with Inertial Fields. Once they catch the kiting Drone Hosts, there is no escape.
Unless there are Iconus Guardians on sight. AFAIK, Repulsion out-ranges Distortion Field, so as long as the Guardians hold out, the Subverters are kept at bay. The unwanted side effect is that your Crusaders can't shoot without leaving the protection of the Repulsion ability, and in doing this, they get hit by Distortion Field and fall silent. Illuminators have the range, but not the firepower, and capital ships aren't affected by the Subverters anyway.
As it stands, they are quite damned expensive when compared to eveyone else.
Each ship is also damned more powerful than each individual enemy ship.
The Jikara Navigator costs an extra 25 credits and 25 metal because it has the ability to capture neutral extractors, which pour in resources faster than normal asteroids, and well justify the extra investment. On a map without neutral extractors, the Navigator is just plain worse.