@Shaavi: Thanks for appreciating my post! The whole point was that Sona and Dev balance each other out. Dev is puts too much emphasis on the physical togetherness (both in the cases of Sona and Soha) and Sona not enough, as she is more comfortable in the realm of ideals. Sona elevates Dev above the everyday and helps him see a future while Dev pulls Sona into the present and forces her to act on her feelings instead of just feeling them and keeping them to herself. That is why they still need each other, both as lovers and as parents.
Also, regarding your post on pg. 44, Asha said Sona was "righteous" not "self-righteous" and there is an important difference (also I am a stickler for words). Righteous has good connotations and just means that you stand for what is right. Self-righteous, as Laxmi pointed out is when you think only you can be right. Sona, in her basic nature, is very righteous. That is what challenged and impressed Dev in the first place (like when she turned down that other job to fulfill her commitment to Ishwari). If she does stray into the self-righteous territory sometimes (and she definitely does), it's because she has grown up believing in a black and white moral world, where the only opposition to right is wrong. This whole history with Khatri should be illuminating for her; sometimes two different approaches that are both 'right' in their place can still disagree and it doesn't automatically make one of them wrong.
@Payal: Not a strange thought at all. I think that is exactly where the Khatri angle is headed. The CVs never make the plot overly complicated -- it's usually the most obvious option from the clues they give, and the clues you pointed out steer us straight in the direction of Ishwari having given in to Khatri's demands in order to pay the rent. That box probably contains some undeniable proof of the act, otherwise Ishwari wouldn't be so worried as her kids wouldn't believe Khatri over her anyway.
@Laxmi: Thanks! I am so glad my post helped clarify Sona's perspective a little bit. She is close to my heart because of how much I related to her from day one of the show. A big part of that is how she tends to live in her own head a lot of the time, and people like that (yours truly included) are often scared to share their deepest feelings for fear that they will lose their perfection when they are translated into messy reality. As we saw, she needed coaxing from multiple people, including Elena, Dada, Asha and Dev himself to allow her feelings to manifest, but because she feels like her ideals were mocked in her marriage with Dev, she is even more protective of her inner-life now. The idealism that defined her love for Dev is on strict lock-down under hard shell of pragmatism and efficiency. That is what Dev means when he says she has become Dev 1.0. He knows Sona's idealism intimately, and he knows that her idealism is what awakened the long-dormant dreamer in him. He is desperately trying to determine whether Sona has merely put her inner dreamer to sleep or killed it.
@hanishank and Anamika: Thanks for appreciating the post!
@Harryfan011: In answer to your question about feminism vs. gender equality, I am putting a part of an old post here. I hope it clarifies this question!
Feminism as a movement is about bridging the gap between the conviction that everyone is created equal and the glaring inequality that is still present in human society. Of course we are all humanists, and no movement should be about putting others down to elevate oneself, but feminism is about changing a system that is built to favour men. Since we have never had an equal society, we don't really know what it looks like and people who think about these issues, and fight for universal rights, are figuring that out, step-by-step, every day. That's what makes varied experience so valuable... we need to know how different people think so we don't leave anyone out of our vision for an equal future.
So basically, feminism is the movement that works towards the ideal of gender equality.