A better approach to Tiger II is making it mutually-exclusive with Sturmtiger/Command Panther/JT. That way the "lesser" untermensch doctrines also have some "teeth" to show in 4v4's.
I disagree with this entirely. Ostheer is stuck with far shittier tanks as their top end armor if they choose a so called "toothless" doctrine. OKW already gets vet 5, their late game power in 4v4 is silly. Tiger II should be doctrine specific, there is no reason why they can't survive with a very superior Panzer IV and Panther. Every other rare super tank in the game is specific to a doctrine.