Personally, I am against making the TAV expressions even more neutral. There is already a mod that allows this and if the expressions were to become such, they would be more in favor of those who prefer to play imagining a tragic story or in any case a TAV who is not happy with the relationship with AA.
I am also against the flag/toggle that changes the TAV expressions based on the selection of certain dialogues in the game. First of all because it is a game mechanic not present in the game itself: in no other situation the TAV expressions change permanently due to the selection of certain dialogues. Second, certain dialogues can be interpreted differently or in any case be selected for various reasons, so giving them as a result expressions of fear is still a way of forcing the player to a certain interpretation.
Third, as many have already said, I do not see why this game mechanic should only be applied to AA. Even with Dark Justicier Shadowheart, according to this way of thinking, the TAV should have different expressions, like of fear, given what she becomes and attests to wanting to do as Shar's favorite.
If certain dialogues really need to be given a result, it would make more sense to remove the kiss option, given then, reading the various posts, not only the expressions are triggered, but the kiss animations themselves.
So in my opinion the best solution is to ask that the mods for the kiss expression with AA be inserted into mod.io, or that Larian find a way that also allows those who use consoles to download them and use them. So whoever wants the expressions of patch 6 and whoever wants a happier TAV, can do it and maybe even for those of Larian it is an easier way to please everyone.
Another thing I'm in favor of, if it's something that can get everyone to agree on even regarding expressions, is to soften AA's kiss animations, since they are perhaps the thing that trigger the most. It was a proposal that had already been put forward in the other thread about patch 6.
I personally like AA's kisses, but I'm absolutely not against changing them.