As for the rest, I dunno, where was your concern for balance when you were buying the Skorp? I'm sure I can cherry pick features of that vehicle too.
Where was my concern for game balance? How about right here? http://forum.worldoftanks.com/index.php?/topic/509570-★-rheinmetall-skorpion-g-review-the-venomous-assassin-★/
I clearly pointed out that it was on the over-powered side, and that it was too good for a Premium tank. I used harsher language about it earlier in other posts, but got shut down by WG for it ("Not something a Community Contributor should say"... Obviously I don't care about that anymore; I'm going to be as honest as I can be now).
And I didn't buy the Skorpion G - WarGaming gave it to me. I didn't even have an opportunity to say yes or no to it - It just showed up in my Garage (I will admit, I still would have said yes to review it and to mountain goat with it). And yes, I enjoy the tank... But I also actively acknowledge that it was over-tuned for a Premium vehicle. However, the Skorp G at least had downsides compared to tech tree vehicles - Primarily the massive lack of armor and camo (Rhm's entire tank is smaller than the Skorp G's hull, and has double the camo values).
The Defender is even more out of line than even the Skorpion G was. I had fully hoped that WG would realize their mistake with the Skorp G and not go down further that path. They didn't, and continued introducing better and better Premiums.