I am a big firefly fan.
However you are wrong when you say FDEV missed an opportunity. In Elite lore prior to Firefly they have dredgers, which are huge behaviors that are basically Reavers.
Dredgers aren't in the game either.
By missed opportunity, i'm talking about content in the game. Not ideas or lore that may or may not have been retconned out of existing. Such npc archetypes would be interesting, compared to the (all bad guys are pirates or opposing military) setup they got going on. It would be like a universal adversary akin to thargoids but it could have existed from day 1 and be an ongoing plot-point. All low hanging fruit that requires minimal new content to implement. Hence, missed opportunity.