After reading all your comments, I think the problem in the way in which the makers portray Katha is that she mostly shows two sides of herself: happy mamma Katha, and the angry-at-Viaan Katha. At least this is my opinion. That's why I find her scenes boring, since I know what to expect from her in each scene. I liked Katha during the Abdali meeting scene, since she was cracking jokes and everything, and it seemed like she was being natural. But that was just one scene. We are now back to happy mamma Katha or angry-at-Viaan Katha. What makes Viaan interesting is he shows a whole spectrum of emotions, which keeps the audience on their toes. You don't know what he will do next. Like I understand Katha has gone through so much that she has become stoic, but even a stoic person shows different sides of themselves.
Also, I have to say that Viaan standing outside her house at night (in the precap) is a bit creepy 😕 Only now we are starting to like Viaan, please don't show him making stupid decisions like this again!!