A Tiger Ace is going to quite cold comfort to you due to it's high CP cost and poor ability to deal with massed medium/heavy armor. It's something that can help seal the deal late game, but it's not going to stop you from losing before it comes out obviously.
A well controlled ace can kill many mediums on its own without support.
Mines are the way to stop the ace. Or a surround (if hes dumb enough to let you do it)
Besides that my argument was not when it comes out, Its that its very effective along with the panther, When you said ele was the only good Wehr tank.
Tiger ace and Panther do what they are meant to do.
Stug IIIe also fulfills this role (although OP)