Scarab is a Tri-Tachyon exclusive hull. Not even the Independents, who have access to every other standard hull, use it.
Factions having special hulls and/or variants would be nice, and it would be nice if player can get something special of his own if he can establish his own faction.
Luddic Church is boring, hardly worth raiding Eos Exodus. Sindrians use Conquest and some (A) ships, but otherwise use standard hulls. Only thing worthwhile about them is their star system.
Pirates use little more than broken-down clunkers, but at least they are visually distinct and identifiable, much like Hegemony's XIV.
Tri-Tachyon is the only faction that uses high-tech prominently. Sindrian fakes it with Lion's Guard, and Independent use everything except Scarab and faction specialties like XIV.