There are the three main factions, each with one or more sub-factions
- Rebel = The Resistance + The Rebel Alliance
- Imperial = The First Order + The Galactic Empire
- Scum = Scum and Villainy
So what that would mean is that if in the future there is a Resistance ship released with a crew slot for example, you would be able to field it with say, R2-D2, because it is limited to "Rebel only," which is the primary faction and thus would be allowed.
Using the faction limitations they could release a fix for the T-65 X-Wing by limiting it to "Rebel Alliance X-Wing Only" and eliminate it being allowed on the T-70 because it is part of The Resistance sub-faction instead.
Or they could just say "eff it" let us fire those force guided torpedoes ![]()