Agree with majority of your points.
I think rather than "superficial" some of her recent actions seem unnecessary given that trimurti, pp have not just disliked her, but they hate/harm her but in an effort to whitewash these characters they are making Sai a bit too forgiving and its like she forgot all the terrible things they say/do. But thats coz they are trying to get to showing Sai n family accept each other.
I agree that Sai need not have persisted with taking pp down with her but in itv they exaggerate. They have to show Sai successfully bring pp down. But i think going to call her and trying to convince her to join a family function wasnt wrong. And she didn't cross any lines with pp. On the other hand, its pp who lacked all courtesy and didnt care that it was the girls birthday and she could firmly but politely ask her to leave. Instead she spews nonsense and when she shoved Sai away accidentally she is still more bothered about virat than helping the girl up. Even in that situation she lacks all insaaniyat.
Sai in all her zidd, childishness has never been inhumane. She has a sharp toungue but never has she blurred lines of right/wrong. She has never done anything with malicious intent like pp, Trimurti. And i think if her actions sometimes misfire despite good intentions she should not get called kaku 2.0, junior kaku etc
Dear I belong to a joint family. I understand how that feels if one person refuses to be part of any family gathering. It's so hurtful. Pakhi behaved the way she normally does. And their equation isn't like any normal sister in laws and it's known to all. That dragging part was not necessary at all. There is always a middle ground to choose what I mentioned above.
I have always said in my other posts that Sai sees the world as black and white. The only person who could show her the thin line between black and white is gone. Poor girl often gets into trouble for that.
It's Sai who is doing all the adjustment and compromises in the family but in her way. That's like many modern day girl. But she is nothing like BK who wants to control everything around her and also wants to be worshipped by all.