While I think that in this case there is no real advantage taken (like someone with a ping of 800 using autoblocker - when he clicks it will be too late anyway), it is definitely worth thinking about it.
I don't think the advantage of a wallhack would be too big. This game is still about melee, it's not a real shooter, there is no shooting through solid objects, and most fighting is still done in melee, the only thing where a wallhack would help there would be knowing if someone is waiting behind a corner or not, but you need to be careful around corners anyway, so it's not worth the effort.
The only thing where this really matters is to be able to spot someone who is shooting either out of a haystack or a bush. And as I think those haystacks are lame and should all get an invisible skin, anyway, only the problem of the bushes remains. And to be honest: I never had problems spotting someone in bushes, a bush with someone hiding in it has a dark, often colourful shilouette in the middle which other bushes do not have, so with a little bit awareness you don't need a "bushhack"
Concerning the matter of invisible textures: I have literally NO CLUE of programming, but don't those bushes and trees have the "empty" texture around the leafs, the thing which is that chequer in Photoshop? You know, making them some kind of "ingame-.png"?
If so, then you could easily make a texture which consists mainly of "nothing", only with a few thin lines in a certain colour to show if it's wood or stone or whatever. That way houses, trees and other obstacles would look like some weird wire skeletons, you would see where they are but you could see everything behind them.
I guess the developers take so much time replying on this matter as they need to be careful what to say and what not, to not encourage some cheating attempts. Perhaps my post will even be edited or deleted, if I am right...
On the other hand I still say that the "cheat" is not really a massive advantage, only a small help in certain situations. That's why I wouldn't take it too serious.
Anyway we have massive differences in gaming quality concerning the systems. I have a good system, I have HDR enabled, and I can see perfectly at night. I heard many people can't see shit at night. Am I cheating? If not, where is the line? Implemented option or not? What makes this a good line?