Well, form my experience, I see many people consider my ships un FL-ish. Then: I wonder
What if FL 1.0 came without the Z-series borderworlds ships, BSg series never existed and something like a viper was in 1.0 What would then be less FL-ish? the sabre? Or the viper?
FL-ish means resembling 1.0 ships or following their construction patterns. In 1.0, fighters were nearly one-manned warships. Autonomous, capable of surviving in space for a long time, ferrying limited amounts of cargo, etc... Vipers are more like modern carrier-based aircraft. Limited fuel, ammo, life-support... They are a weapon of the carrier, but alone don't survive long either. A different conception from FL.
Why aren't battlestars FL-ish?
Size/crew comparison: A typical FL/SL capship had up to 500 crewmembers. A fully-automated Mercury-class Battlestar - 1700. a Bremen-class carrier (Starlancer) was some 500 meters long, Galactica - over 2 kilometers. If it was brought into FL along with all its original features, a single battlestar would be a match for any house in Sirius.
At any rate, Freelancer is a concept, BSG is a concept too, they differ in only finer points, but are still the same. BSG functions just like FL - fighter groups doing most of the work, capships rolling in when eney capships appear, they are (just like the Reliant, Yamato, Osiris) bases for fighters. Technological differences exist too. BSg doesn't (yet?) utilize energy shields or energy weapons, only immensely heavy armor plating and railguns/missles/nukes
Personally, trying to make disco FL-ish at this point is simply futile and at times, hypocritical. Some ships, straight out of FL look perfect in here, blend in expertly.
Discovery isn't 1.0 anymore, trying to make it look 1.0 only pulls it backwards. A continuity of the 1.0 plot is most welcome, the KU-BR war for example... But Sirius is not surrounded by a Maginot line. Out there... Anything might be.