The reason people are bringing up other companions is because imo it is unfair to only provide Astarion this level of treatment. Every other romantic path includes a smiling Tav/PC with their love interest kisses - no matter their alignment. People are asking for this path to be changed again because they want to support their narrative reading (typically noncon/ ‘abusive’) of this path.
As have been pointed out already, this 'unfair' treatment has already happened. Larian already worked on AA kisses twice instead of fixing the amount of Spawn's kisses and lines. Both animations for AA kisses exist. Already. It's too late for this argument.
(Warning, discussion of rough scenes)
Also, DJ Shadowheart doesn't choke you in her kisses. She doesn't put Tav on their knees.
So this is completely different. Also, it's not like Shadowheart's fans (or any other companion's fans for that matter) are currently unhappy with their Tav's facial expressions.
And yes, I want my narrative reading of this path. I play it exactly for non-con. Just like I (and many other people) play Haarlep scene. So what?
(Warning: discussion of a possible non-con)
It's already one of the canon paths that AA won't let Tav break up with him when tadpoles are gone. And once again in the epilogue. Which is the very definition of doing something against other people's consent. It is already in canon.
So my reading is completely valid and based on AA's possible canon. This exists in the game for a reason. Just like his new line: "You didn't leave me, I let you go." He again reinforces how Tav belongs to him and he has complete control over their actions.