I don’t think people necessarily expect you to call the mechutanim. I could just be as a hechsher for the family. Imagine if the mechutanim listed are a very well respected Rosh Yeshiva/ Rebbe/ Askan etc. Wouldn’t you think to yourself “Hey if these people saw fit to marry into this family they can’t be that bad”. It make you realize that you are not the first daring ones.
I do like the idea of shidach resumes even though we did have them in the alter heim. When I was dating we got the same information over the phone and had to write it down Resumes is just a more efficient way of sharing information.
There are a few other things we did not have in the alter heim but I think they are improvements (cars, washing machines, gas ovens etc.)