Why is Kuhu's attitude self-absorption and Mishti's insensitivity to Kuhu's feelings poor writing?
Because Kuhu’s self absorption is a constant and ever present part of her personality while Mishti’s insensitivity is shown inconsistently and mainly only played up since the Rishta Track. Before this track started, she was more sensitive to situations around her. Kuhu has only been talking of superficial and self absorbed things since day one.