The problem is self explanatory. Without armor, even a Thor RH Bomber, Havoc Mk II Bomber, Nomad Bomber, BHG Bomber, Kusari Bomber, and Dragon Bomber would die after taking a single hit from a Mini Razor.
Anything short of a Falcata (having 19,800 armor, leaving it vulnerable to death if simple 1 single barrage of gunfire hit the hull before the MiniRazor...)
Cap Armors, they have their place as well providing some additional lifetime vs enemy bombers, which as Kurosora stated only takes two bombers to make a winning fight against a battleship. And theres alot more than 2 bombers out there in Discovery.
I say a capital ship is lucky to only run into just 1 or 2 bombers. While on Krusa.Corraine I generally fly against a gunboat with another gunship as support (keeping the fire off me mainly and helping with shields) or a second bomber.