Every faction has evolved since vanilla. Look at the lane hackers. Do they even have a colonized planet? (On a side note, do the LH still have that Spyglass battleship? The wiki redirects to a HL ship) I think every faction should have at least a gunboat at some point. Even, eventually, the Freelancers who are starting to become a faction in their own right.
But then my perspective is mostly limited to what goes on in southern Sirius, so grain of salt +1.
Also, from a player perspective, fighters bombers and even GBs are -cheap-. Aside from armor upgrades, capital ships, and maybe codenames, there's not a lot in the mod that one has to save up money for. Maybe this will change with the coming of player stations?