Indeed its inclusion makes much less sense because KV1 and KV2 were early war Soviet tanks that were mainly destroyed/abandoned in the first year of the war, whereas the German rare weapons like Ostwind, Elephant, Sturmtiger etc. fit very well with the "ZOMG ZUPERWAFFEN" narrative Relic loves so much.
The KV1 was extremely good at the start of the war, the Germans didn't develop an effective counter to it till
1942, and the KV2 when it did see action was fairly effective.
The KV1 series of tanks was used in the Battle of Kursk, but it was discontinued because it had the same gun as the T34 series but it was slower which didn't fit the Soviets tactics.
I don't see what your complaint about rare German weapons is, everyone wants Soviets and USF to get some of the cooler rarer tanks, but OKW was given what it has because Relic wanted a faction that didn't use medium tanks.
Its not like there are static forward HQ's called OKW trucks, and its not like there was ever a mechanic like vCoH Brit Emplacements...
But of course people will start whining when static objects are introduced and get destroyed in one tank shell, because design definitely cannot otherwise be special and overcome issues.
But trucks do get brutally owned by indirect fire? It's the best counter to OKW. But with OKW your trucks are somewhat durable, a emplacement with a exposed crew, not so much. Not to mention OKW and Ostheer have other counters to armor outside of the Pak43...