One of the most irritating things about Star Trek canon is its diktat that the Klingons are just fundamentally conservative when it comes to ship design, using the same designs (with incremental updates) for decades if not centuries.
Respect to them for endeavouring to explain the nonsense that we only ever see 5 Klingon ship designs in the entire TOS/TNG/DS9/Voyager period (plus another two or three in Enterprise, and discounting J.J. Abrams’ reboot and the supposed “Klingon” designs from Discovery), equating to 6-8 ship classes because stupid modelling decisions (see last time for my rant on the B’rel/K’vort inanity). But “if it ain’t broke, don’t fix it” only goes so far. There comes a point at which an old hull and layout simply can’t accommodate the new and improved technologies that have been developed since its inception, leaving your fleet at a serious tactical and strategic disadvantage.
Besides all that, between all the incremental advances in technology crammed into the same hull (even if it’s a new hull on the same basic design), over time standardisation in your fleet is going to suck, as newer builds theoretically in the same class will end up with vastly different capabilities than older construction. When this involves engines, it means your “same class” of ships are going to have different sustained speeds, making fleet manoeuvres artificially laggy because you have to move at the speed of your slowest vessel.
That the Warrior Race would be okay with this beggars belief, even if Imperial science is a bit lacking compared to the Federation or the Romulans. They’re warriors, not morons. They like to operate their ships in squadrons (we see formations of three ships a lot), so this is not something their typical tactics can work well with. And I’m really not convinced that the Klingons are as primitive as it’s claimed. They did discover the warp drive considerably before humans, after all.
My preferred take on this apparent lunacy is that the Klingons “really” have numerous other ship classes that we never see. Maybe since the Federation are a bunch of nonaggressive pansies (and allied in the TNG period), they feel okay about dumping all of their older, obsolescent ships (like aging B’rel and K’vort classes) along the Federation border. Maybe those classes are all that were in range to muster for the Dominion War; that plus injudicious camera angles would explain the absence of anything else from the Klingon attack fleet there.
Anyway, I firmly believe there are numerous Klingon ship classes we’ve never seen, including any number of more experimental-looking designs.
Like this one.
I’m calling it the Tik’leth-class, after the Klingon longsword mentioned in beta canon, (probably a far better aggressive weapon than the almost solely defensive bat’leth). Four warp nacelles because I liked that feature of Picard’s old Stargazer, but in a much more typically Klingon configuration. Armed to the teeth because Klingons, I’m figuring this as representing a semi-experimental class, a little shorter than a Vor’cha-class but much wider and beefier.
Since it has four warp nacelles, it should have power to spare and be at least as fast as anything the Federation can muster prior to a Sovereign-class, and that power ought to let it incorporate some massively powerful disruptors. Hopefully ones with all-around firing arcs, since canon Klingon ships exhibit a major deficiency in rear-firing weapons. I reckon they’d beg, trade or steal the specs for the quantum torpedo from their Federation allies, so the IKS Tik’leth would probably get refitted to use those, too.