1. Prashant needs a vry strong support right now which can only be provided by Tai ji... Shobha is outright against the idea that has been going in Prashant's mind and Dubey for now is unaware of his son's motive and also till the last BMT session, he's not going to tk a risk... Also, he's indebted to Yash n Aarti for his son's life..
So, Tai ji right now is that person who's gonna support Prashant all out in his motive without a thought going the other way...
2. Tai ji particularly represents that backward mentality society and those sick people who still consider women just a showpiece... In PV, there was no character who was outright against the idea of PV.. Bua ji only has a prob wd Aarti since she got re-married n Bua didnt but she isnt rlly against the idea of PV while Tai ji is.. So Tai ji represents the negatives of the society which is being tackled by the CVs as a social message with how they used Shobha today to strongly counter these backward n disgusting mentality...
I gues.. For now.. I can think of only these 2 reasons and it pretty much clears up how important Tai ji's character is for the show and for its story...
Love,
Abby!