Its easy to say no, or just do nothing, when nobody knows your wasting their time. When a girl knows that Moshe Shmendrick is supposed to give an answer and he takes his sweet time, he will start to get a reputation. Nobody will redd him a shidduch. the way it works now, give Moshe the name, it will sit on his list for 8 weeks and if he feels like doing the person who gave him the name a favor, and looking into the girls, he will. If he is a tzadik, he may even call back with a yes or no. I dont believe girls will be like that.
As an aside, I think the way weve twisted the shidduch process also dictates the girl should be redd the shidduch 1st.
The gemara uses the analogy of someone who loses an object, as to why the boy goes out looking for a girl. the way we have things today, every boy is the greatest metziah in the world, so its only right that the girls should have the lists and go looking for the boys.