A unit that costs more should always be better because you have to wait longer to get it and pay MORE for it. This is the entire basis of which every RTS is founded on, the cost of your army shouldn't be twice as more as the opponents and lose just because ~reasons~ if you are playing with equal amounts of skill.
The KT is the most expensive tank in the game dude, the Panther for Ostheer is the most expensive Ostheer tank in the game factoring teching costs.
Call in meta is stupid, and the fact you want to make OKW like that is just soul breaking because it would make OKW a lot more OP.
Contrary, it would not make OKW more OP. It would make it less OP.
As Soviets or Ostheer you need to have call in commander.
Because of this, very good, useful commanders won't be seen, becasue they don't have Tiger/IS call in.
As OKW, you give a garden commanders. You can use all of them and you won't lose anything.
If I want to use anti infatry doctrine as Soviets, Im losing IS2.
If I want to use lefh doctrine I won't get a Tiger.
As OKW you can go for whatever you want since you always have KT.
Pak43+KT? Fucking broken.
In 4v4 you can even go for Jadgtiger + KT. Even more fucking broken (but that happens only with ver, very long 4v4s).
Putting KT in place of Pz4 in elite armor for example would change a lot.
Now you have to decide if you want KT or Pak. KT or Jadgtiger. KT or... That's not OP, that's the way it should be.
Let me put it in different angle.
Image Ostheer with non doctrinal Pak43 + doctrinal Tiger Ace, Elephnat or Tiger.
Or non doc B-4 + doctrinal IS2.