While I may partly agree with giving the ability to choose the expressions a player prefers to see on their TAV, let's be honest.
Everyone has their own way of playing and interpreting the story, but in your narrative, how important are kisses? Since you imagine a victim TAV who hates being treated in a certain way by AA, I don't think you'll often click on the "Can I kiss you?" option. While you may find certain expressions more suitable for your TAV, I don't think you like seeing them all the time.
I also believe that the victim TAV narrative is a story that you play from time to time, but for the rest I think you prefer to play in other ways.
There are players who play AA all the time: whether the TAV is good or bad with that story or another, AA is often the partner. For these players, for their narrative, kisses are a fundamental thing. For you, kisses are a relative thing, they are not that important. Knowing that TAV has certain expressions reassures you in your ideas, but I repeat: how many times will you use and see your TAV kissing with AA? Maybe some have never seen them because, first of all, they can't stand AA.
So, in my opinion, this is also why the authors then decided to fix the expressions, because they realized that the main users of them are those who imagine a romantic relationship with AA.