I am more surprised why KV-1 and KV-8 are not restricted to 1 as they are both heavy tanks...
The fact that KV-8 is not tier restricted is fine, in a normal matchup you can get a stug 3 and 2 paks at least until it comes out.
Even if you loose you can still have paks that can keep it at bay, its not tanky enough to survive 2 paks. What is really hard to counter is multiple KV-8`s
As whermacht it is counter by paks and stugs but as OKW it is so hard figthing against it.