The problem is, that KV2 has no need for its gun. It stays something better gets removed.
Do you mean the KV-8? I'm pretty sure the KV-2 needs its gun.
It was changed because KV8 was never build in 1vs1. Before it couldn't really do anything vs PZIV so it had no place in the meta. You still have to change the weapon. Its not like the Churchill which shoots with both weapons.
It was never built in 1v1 because the only 1v1 doctrine it was in was Shock Rifle and you'd always stall for the IS-2 instead. That, and it wasn't that good at anti-infantry duty either.
You don't need to make the KV-8 a generalist if it's a good enough specialist.
Visual language is very important in a game so determined to hide its stats behind vague statements like 'improved mobility'.
You'd expect the KV-1 to have penetration like a T-34/76, and the KV-8 to have penetration like a T-70. That used to be true.