Good thoughts
Do you believe a single unit should change the entire out come of the game? Do you believe this unit should require the opposing player to throw everything they have at it to be able to defeat it? Those are super hero units in my opinion and should not be in this game. King Tiger v1 was a great example of this. I aliken it to your special character in Dawn or War II expect with more power as you can field numerous of them at the same time.
Apparently, given Relic's track record hero units are here to stay.
Comparing a tank on tracks to a B4 is a bit silly. I have been using the B4 religiously since the patch and it does pretty good again the OKW but that is not the point.
I thought of the one time call in. It's still an option but I thought of it being a bit too harsh. It would work though in preventing the massing of the units.
I understand balancing is hard. Just looking at the StrumPio's I can see that a lot of thought whet into giving a opening unit a weapon profile that is better than anything the Allies can yield shy of a HMG.