If we're going to use the same logic here as the flares where "oh we're removing it from this faction so that means we should remove/not give it to the others" then the B4, Railway arty and the 240mm barrage as well as concentrated barrage should either all be entirely reworked or removed from the game as well then.
As far as your opinion goes on not having the Sturmtiger like it's shown in the video, again, that's just entirely your opinion and you cannot prove that it'd be impossible to balance in any sort of way until it's actually tested and people give their feedback on it like I've already said. These wild guesses and assumptions going off of currently implemented badly designed and balanced units I don't believe have anything to do with with this right now taking into consideration that it'd be something entirely new and unique, not to mention different.
Of course it is only an opinion of mine, just like you saying it can be balanced.
But the game has been moving away from quick wipes that you can do nothing about to a more consistent model of damage on basically every single unit.
We're having balance issues with units that already fit this design in general. Throwing a unit into this that basically does exactly the opposite of what the game has come to be over years now will be either impossible to balance or very, very hard to find a right spot at the very least. Especially considering differences between modes etc etc.
Regardless of what you and I personally think about this style of game in general, it should be fairly obvious that one trick ponies like the ST will be a tough nut to crack. And it is probably worth neither the effort/time that will be missing on working on other issues nor the risk of almost breaking a game mode for bringing a single unit back to life.